A water soluble lubricant for a condom and a condom spread with said water soluble lubricant

Abstract: The present invention relates to a water soluble lubricant for condom and a condom whose surface is spread with said water soluble lubricant, and said water soluble lubricant for condom has a good penetrating feature to the wound up part of a condom, does not whiten the surface appearance of a condom, provides sliminess and wettability with a condom. The concrete example of water soluble penetrating agent which has good penetrating effect to the wound up part and does not whiten the appearance of condom is at least one selected from sodium-lactate and trimethylglycine, the hemectant which provides a condom with good wettability is at least one selected from glycerin and propyleneglycol, and the water soluble sliminess agent which provides a condom with sliminess is pullulan.

Description: BACK GROUND OF THE INVENTION The present invention relates to a water soluble lubricant which is used for a condom and a condom whose surface is spread with said water soluble lubricant. DESCRIPTION OF THE PRIOR ART As a lubricant to be applied to a condom, the lubricant which satisfies following two items is required. Namely, a property to penetrate easily into a wound up part of condom after it is dropped on a wound up part of condom, and a sliminess property when it is used. In general, a lubricant which has an excellent slipping ability is ranked with a good lubricant, however, as a lubricant for condom, a lubricant which merely has a slipping ability is not required, but a lubricant which has adequate sliminess and appropriate slipping resistance is required. That is, the lubricant which has low static friction, high dynamic friction after started to slip and appropriate slipping resistance is required. In this invention, the mentioned physical property is called sliminess. Further, it is required to a lubricant for condom to penetrate into a wound up part of condom homogeneously when it is dripped on the wound up part and furthermore required to provide a condom with a wettability. These effects can be generated by the combination use of two or more kinds of lubricant. Presently, a silicone oil is mainly used as a lubricant for a condom. Silicon oil is applied to a condom. However, since silicon oil is a lipophilic agent and is not water soluble, it has a problem that it is very hard to be removed when it is adhered to a skin or clothes. To solve said problem, many kinds of water soluble lubricants are proposed. However, when the most of these proposed lubricants are applied to a condom, they have a tendency to whiten the condom by water absorption and not only affect the appearance but also deteriorate the feature of condom. The lubricant which is applied to a condom disclosed in Japanese Patent Laid open publication 7-267849 is one of the method to solve the problem. The feature of the invention disclosed in said publication is to add squaran to the lubricant. Squaran differs from the conventional silicone oil, which has slimy touch, superior at lubrication and humidity, comfortable touch because of it's water solubility, does not whiten a condom and does not affect the physical property of a condom. However, since the squarane blended lubricant for condom have a following problem, squaran is not a sufficient one. That is, the lubricant does not easily penetrate into a wound up part of condom and the rubber film adheres tightly, so it becomes hard to wind off it at the actual use. Further, the squarane blended lubricant for condom can improve the sliminess by increasing the viscosity, however, a threading phenomenon occurs along with the increase of viscosity and deteriorate the appearance of condom as a commodity. Therefore, this lubricant can not be used as a slimming agent. OBJECT OF THE INVENTION The present invention is carried out to solve the above mentioned problems. The object of this invention is to provide a water soluble lubricant for condom which can be easily removed by water when adhered to a human skin, which does not occur the whitenning phenomenon of a condom by water absorption and which has a good penetrating property into a wound up part of a condom, gives a condom with a sliminess at the actual use, moisturizes a condom and improves a wettability. And another object of this invention is to provide a condom whose surface is spread with said water soluble lubricant. BRIEF SUMMARY OF THE INVENTION As above mentioned, the object of this invention is to provide a lubricant for condom which penetrates easily into the wound up part of condom and gives a condom with a sliminess at the actual use, and another object of this invention is to provide a lubricant for condom which improves a wettability of a condom and moisturizes a condom, and a lubricant for condom which penetrates easily into the wound up part of condom. Further, the other object of the invention is to provide a condom whose incompatibility at the actual use is improved to have a natural feeling by coating the condom with above mentioned lubricant for condom. The above mentioned objects are accomplished by following water soluble lubricant for condom and a condom whose surface is spread with said water soluble lubricant. Namely, as the water soluble lubricants which are superior at the penetration to the wound up part of a condom and do not whiten the appearance of a condom, one or more kinds of aqueous solution of agents selected from the group composed by sodium lactate, trimethylglycine, dl-sodium malate, monosaccharide and salts of dl-pyrrolidonecarboxylic acid can be mentioned. As the water soluble lubricant which provide a condom with sliminess, at least one kind of aqueous solution of agents selected from the group listed below can be mentioned. That is ; pullulan, ammonium-polymethacrylate, sodium-starch·glycollic acid, sodium-polyacrylate, polyvinylpyrrolidone, xanthane gum, guar gum, gellan gum, tamarindo gum, tarra gum, locust bean gum, arabian gum, sodium alginate, propylene glycol alginate, karaginane, sodium-carboxymethylcellulose, dextran, furcelleran and sodium polyacrylate. Further, as a humectant which moisturizes a condom, at least one humectant selected from the group consisted by glycerin, propyleneglycol and polyethyleneglycol having 200 to 600 average molecular weight can be mentioned. And further, the present invention is a condom whose surface is spread with said water soluble lubricant. As a lubricant to be applied to a condom, a lubricant composed by an agent which has good penetration to the wound up part of a condom (this kind of lubricant is simply called a penetration agent) and an agent which provide a condom with sliminess (this kind of lubricant is simply called a slimming agent), or a lubricant composed by said agent to which an agent provides a condom with a wettability (this kind of lubricant is simply called a humectant) is added can be used. DETAILED DESCRIPTION OF THE INVENTION Referring to the lubricant for condom of this invention, in the lubricant composed by a water soluble lubricant which protect a condom from whitenning and a lubricant which provides a condom with sliminess, as a monosaccharide to be used as a penetration agent, xylose, glucose and fructose are preferably used and when these kinds of monosaccaride are used alone, the desirable water content is 40 ∼ 80 wt%. When water content is smaller than 40 % penetration is not sufficient, and when water content is bigger than 80 % the surface of condom become white. In a case of water soluble lubricant which provides a condom with sliminess, less than several % of refined water is added to slimming agent. The viscosity of obtained aqueous solution is, for instance ; in a case of xanthane gum, from 400 to 10,000 centi Poise ; in a case of guar gum, from 200 to 30,000 centi poise, ; in a case of gellan gum, from 5, 000 to 40,000 centi Poise ; in a case of tamarindo gum, from 400 to 20,000 centi Poise ; in a case of locust bean gum, from 400 to 60,000 centi Poise ; and in a case of pullulan, from 5 to 400 centi Poise, and it is desirable to control the viscosity of each aqueous solution in above mentioned limit. As a humectant agent, glycerin, propyleneglycol and polyethyleneglycol having 200 to 600 average molecular weight are preferably used, and usually these are used alone or used together. Further, the inventors of the present invention have conduced many intensive experiments based on many kinds of knowledge to obtain a water soluble lubricant for condom which is superior at easy penetration into the wound up part of condom and having good wettability and slimming feature, and confirmed that such kind of a water soluble lubricant for condom can be obtained by mixing use of following agents. That is, a penetration agent which has an excellent penetrating ability to the wound up part of a condom and does not whiten the appearance of condom, and a slimming agent which provide a condom with a sliminess property are mixed together with a desirable mixing ratio under the conditions mentioned below. Namely, as the penetration agent, a mixture of one or more kinds of aqueous solution of agent selected from a group composed by sodium lactate, trimethylglycine, sodium dl-malate, monosaccharide and salts of dl-pyrrolidonecarboxylic acid is used, and as the water soluble slimming agent, a mixture of one or more kinds of aqueous solution of agent selected from the group composed by pullulan, ammonium-polyacrylate, ammonium-polymethacrylate, arabian gum, dextran, tamarindo gum, furcelleran, sodium-starch·glycollic acid, sodium-polyacrylate, polyvinylpyrrolidone is used. As the water soluble lubricant, it is confirmed that an excellent lubricating effect can be obtained by using main aqueous solution of sodium lactate and dissolving one or more kinds of aqueous solution of agent selected from the group composed by ammonium-polyacrylate, ammonium-polymethacrylate, arabian gum, polyvinylpyrrolidone dextran and pullulan to the main aqueous solution. As the water soluble lubricant, it is confirmed that an excellent lubricating effect can be obtained by using main aqueous solution of trimethylglycine and dissolving at least one kind of aqueous solution of agent selected from a group composed by arabian gum, dextran and pullulan to the main aqueous solution. As the water soluble lubricant, it is confirmed that an excellent lubricating effect can be obtained by using main aqueous solution of sodium lactate and adding trimethylglycine in a limit in which ammonium-polyacrylate is not crystallized to the main aqueous solution. As the water soluble lubricant, it is confirmed that an excellent lubricating effect can be obtained by using main aqueous solution of sodium lactate and adding trimethylglycine in a limit in which ammonium-polymetacrylate is not crystallized to the main aqueous solution. As the water soluble lubricant, to the main aqueous solution composed by sodium lactate, one or more kinds of aqueous solution of agent selected from the group composed by ammonium-polyacrylate, ammonium-polymethacrylate, arabian gum, polyvinylpyrrolidone, dextran and pullulan are added. In this case, when the water content of aqueous solution of sodium lactate is from 40 to 80 % by weight, the prepared solution displays a good lubricating feature. When the water content is smaller than 40 %, a penetration to the wound up part of condom is not sufficient, and when it is bigger than 80 % an appearance of condom becomes white. As the water soluble lubricant, arabian gum alone is dissolved into aqueous solution of salt of dl-pyrrolidonecarboxylate. When the dissolving amount of arabian gum is from 0.5 to 8.0 wt% to aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution shows a good lubricating feature. When it is smaller than 0.5 % a lubricating feature is not sufficient, and when it is bigger than 8.0 wt% a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, arabian gum alone is dissolved into aqueous solution of salt of dl-pyrrolidonecarboxyllic acid. When the dissolving amount of arabian gum is from 0.5 to 8.0 wt% to aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution shows a good lubricating feature. When it is smaller than 0.5 % a lubricating feature is not sufficient, and when it is bigger than 8.0 wt% a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, pullulan alone is dissolved into aqueous solution of salt of dl-pyrrolidonecarboxyllic acid. When the dissolving amount of pullulan is from 0.05 to 3.0 wt% to the aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution indicates good lubricating feature. When it is smaller than 0.05 %, a lubricating feature is not sufficient, and when it is bigger than 3.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, tamarindo gum alone is dissolved in aqueous solution of salt of dl-pyrrolidonecarboxyllic acid. When the dissolving amount of tamarindo gum is from 0.02 to 1.0 wt% to aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution indicates good lubricating feature. When it is smaller than 0.02 %, a lubricating feature is not sufficient and when it is bigger than 1.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, furcelleran alone is dissolved in aqueous solution of salt of dl-pyrrolidonecarboxyllic acid. When the dissolving amount of furcelleran is from 0.2 to 6.0 wt% to aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution indicates good lubricating feature. When it is smaller than 0.2 %, a lubricating feature is not sufficient and when it is bigger than 6.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, sodium-starch· glycollic acid alone is dissolved in aqueous solution of salt of dl-pyrrolidonecarboxyllic acid. When the dissolving amount of sodium-starch·glycollic acid is from 0.2 to 6.0 wt% to aqueous solution of salt of dl-pyrrolidonecarboxyllic acid, the prepared solution shows a good lubricating feature. When it is smaller than 0.2 %, a lubricating feature is not sufficient and when it is bigger than 6.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, it is confirmed that by adding to the main aqueous solution composed by monosaccaharide, at least one kind of aqueous solution of agent selected from the group composed by arabian gum, polyvinylpyrrolidone, dextran and pullulan a lubricant having good lubricating feature can be obtained. As the water soluble lubricant, at least one kind of agent selected from the group composed by arabian gum, polyvinylpyrrolidone, dextran and pullulan is dissolved in the main aqueous solution composed by monosaccharide. When the monosaccaride solution is an aqueous solution of from 50 to 70 wt% of xylulose, glucose or fructose, it displays good lubricating feature. When it is smaller than 50 wt%, these monosaccarides do not solve in water, and when it is bigger than 70 wt%, the surface appearance of condom becomes white. As the water soluble lubricant, arabian gum alone is dissolved in the main aqueous solution composed by monosaccharide. When the dissolving amount of arabian gum is from 0.5 to 8.0 wt% to the aqueous solution of monosaccharide, the prepared solution indicates good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient and when it is bigger than 8.0 wt%, a penetration to a wound up part of condom is not sufficient. As the water soluble lubricant, polyvinylpyrroridone alone is dissolved in aqueous solution mainly composed by monosaccharide. When the dissolving amount of polyvinylpyrroridone is from 0.5 to 8.0 wt% to aqueous solution of monosaccharide, the prepared solution displays good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient and when it is bigger than 8.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, dextran alone is dissolved in the main aqueous solution composed by monosaccharide. When the dissolving amount of dextran is from 0.5 to 8.0 wt% to aqueous solution of monosaccharide, the prepared solution shows good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient and when it is bigger than 8.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, pullulan alone is dissolved in the main aqueous solution composed by monosaccharide. When the dissolving amount of pullulan is from 0.05 to 3.0 wt% to aqueous solution of monosaccharide, the prepared solution shows good lubricating feature. When it is smaller than 0.05 %, a lubricating feature is not sufficient and when it is bigger than 3.0 wt%, a penetration to a wound up part of condom is not sufficient. As the water soluble lubricant, it is confirmed that by adding at least one kind of aqueous solution of agent selected from the group composed by arabian gum, polyvinylpyrrolidone, dextran and pullulan to the main aqueous solution composed by sugar-alcohols, a lubricant having good lubricating feature can be obtained. As the water soluble lubricant, at least one kind of agent selected from a group composed by arabian gum, polyvinylpyrrolidone, dextran and pullulan is dissolved into the main aqueous solution composed by sugar-alcohols. When the sugar-alcohols solution is an aqueous solution of xylitol whose water content is from 45 to 70 wt% or an aqueous solution of sorbitol whose water content is from 30 to 70 wt% or an aqueous solution of marutitol whose water content is from 35 to 70 wt%, it displays good lubricating feature. When the water content is smaller than 45 wt% in the case of xylitol or smaller than 30 wt% in the case of sorbitol or smaller than 35 wt% in the case of marutitol, the penetration to the wound up part of condom is not sufficient and when they are bigger than 70 wt%, a surface appearance of condom becomes white. As the water soluble lubricant, arabian gum alone is dissolved into the main aqueous solution composed by sugar-alcohols. When the dissolving amount of arabian gum is from 0.5 to 8.0 wt% to aqueous solution of sugar-alcohols, the prepared solution displays good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient and when it is bigger than 8.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, polyvinylpyrrolidone alone is dissolved into main aqueous solution composed by sugar-alcohols. When the dissolving amount of polyvinyl-pyrrolidone is from 0.5 to 8.0 wt%, the prepared solution shows good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient and when it is bigger than 8.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, dextran alone is dissolved into main aqueous solution composed by sugar-alcohols. When the dissolving amount of dextran is from 0.5 to 8.0 wt% to aqueous solution of sugar-alcohols, the prepared solution shows good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not sufficient, and when it is bigger than 8.0 wt%, a penetration to the wound up part of condom is not sufficient. As the water soluble lubricant, pullulan alone is dissolved into main aqueous solution composed by sugar-alcohols. When the dissolving amount of pullulan is from 0. 5 to 8.0 wt% to aqueous solution of sugar-alcohols, the prepared solution shows good lubricating feature. When it is smaller than 0.5 %, a lubricating feature is not suficient and when it is bigger than 8.0 wt%, a penetration to a wound up part of condom is not sufficient. As the water soluble lubricant, it is confirmed that by the main aqueous solution composed by dl-sodium malate and at least one kind of aqueous solution of agent selected from the group composed by ammonium-polyacrylate, ammonium-polymethacrylate, sodium polyacrylate, arabian gum, dextran and pullulan a lubricant having good lubricating feature can be obtained. As the water soluble lubricant, at least one kind of agent selected from the group composed by ammonium-polyacrylate, ammonium-polymethacrylate, sodium polyacrylate, arabian gum, dextran and pullulan is dissolved into the aqueous solution composed by dl-sodium malate. When the water content of aqueous solution of dl-sodium malate is from 50 to 70 % by weight, it shows a good lubricating feature. When the water content is smaller than 50 wt%, dl-sodium malate does not solve in water and when it is bigger than 70 wt%, a surface appearance of a condom becomes white. As the water soluble lubricant, ammonium-polyacrylate alone is dissolved into the main aqueous solution composed by dl-sodium malate. When the dissolving amount of ammonium-polyacrylate is from 0.1 to 3.0 wt% to aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.1 wt% lubricity is not sufficient and when it is bigger than 3.0 wt%, a sufficient penetration to a wound up part of condom can not be obtained. As the water soluble lubricant, ammonium-polymethacrylate alone is dissolved into the main aqueous solution composed by dl-sodium malate. When the dissolving amount of ammonium-polymethacrylate is from 0.05 to 2.0 wt% to the aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.05 wt%, lubricity is not sufficient and when it is bigger than 2.0 wt%, a sufficient penetration to the wound up part of condom can not be obtained. As the water soluble lubricant, sodium-polyacrylate alone is dissolved into the main aqueous solution composed by dl-sodium malate. When the dissolving amount of sodium-polyacrylate is from 0.1 to 3.0 wt% to the aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.1 wt%, lubricity is not sufficient and when it is bigger than 3.0 wt%, a sufficient penetration to the wound up part of condom can not be obtained. As the water soluble lubricant, arabian gum alone is dissolved into the aqueous solution composed by dl-sodium malate. When the dissolving amount of arabian gum is from 0. 5 to 8.0 wt% to the aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.5 wt%, lubricity is not sufficient and when it is bigger than 8.0 wt%, a sufficient penetration to the wound up part of condom can not be obtained. As the water soluble lubricant, dextran alone is dissolved into the main aqueous solution composed by dl-sodium malate. When the dissolving amount of dextran is from 0.5 to 8.0 wt% to the aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.5 wt%, lubricity is not sufficient and when it is bigger than 8.0 wt%, a sufficient penetration to the wound up part of condom can not be obtained. As the water soluble lubricant, pullulan alone is dissolved into the main aqueous solution composed by dl-sodium malate. When the dissolving amount of pullulan is from 0.05 to 3.0 wt% to the aqueous solution of dl-sodium malate, the prepared solution shows good lubricity. When it is smaller than 0.05 wt%, lubricity is not sufficient and when it is bigger than 3.0 wt%, a sufficient penetration to the wound up part of condom can not be obtained. As the water soluble lubricant, it is confirmed that by solving at least one kind of aqueous solution of agent selected from the group composed by arabian gum, dextran and pullulan into the main aqueous solution composed by a mixture composed at least by two kinds of agents selected from sodium lactate, trimethylglycine, salt of dl-pyrrolidone-carboxylic acid, monosaccaride, dl-sodium malate and sugar-alcohols, a lubricant having good lubricity can be obtained. As the water soluble lubricant, it is confirmed that by solving at least one kind of aqueous solution of agent selected from a group composed by ammonium polyacrylate and ammonium polymethacrylate into the main aqueous solution composed by a mixture of sodium lactate and dl-sodium malate, a lubricant having good lubricity can be obtained. As the water soluble lubricant, it is confirmed that by solving polyvinylpyrrolidone into the main aqueous solution composed by a mixture composed at least by two kinds of agent selected from sodium lactate, monosaccaride and sugar-alcohol, a lubricant having excellent lubricity can be obtained. When a water soluble penetrating agent to the wound up part of condom or a water soluble sliminess agent are composed by mixing a plurality of agent, it is confirmed that by controlling the mixing ratio of each agents within the region from 0 (zero) to the maximum soluble amount of single use of these agents, a lubricant having good penetration to the wound up part of condom and good sliminess can be obtained. Further, the inventors of this invention, have confirmed that the plural types of water soluble lubricant which have good penetrating effect to the wound up part of condom, good wettability and sliminess can be prepared by mixing or solving a humectant which provide good wettability and reduce a disconfortability by using a condom, with a penetrating agent which penetrates easily into the wound up part of a condom and does not whiten the surface of a condom and a sliminess agent which provide a condom with sliminess, by the conditions mentioned below. As the water soluble penetrating agent to the wound up part of condom, sodium lactate, trimethylgricine, sodium dl-malate, monosaccharides, salts of dl-pyrrolidonecarboxylic acid and sugar-alcohol can be used, especially sodium lactate and trimethylgricine are preferably used. The aqueous solution composed by at least one kind of said agents is used. As the water soluble sliminess agent, pullulan, ammonium polyacrylate, ammonium polymethacrylate, arabian gum, dextran, tamarindo gum, furcelleran, starch: sodium glycollic acid, sodium polyacrylate, polyvinylpyrrolidon and others can be mentioned and especially pullulan is preferably used. The aqueous solution composed by at least one kind of said agents is used. And as the humectant, glycerine, propyleneglycol and ethyleneglycol of 200 to 600 average molecule weight are preferably used, and the aqueous solution composed by at least one kind of said agents is used. As the water soluble lubricant, a main aqueous solution composed by sodium lactate to which at least one kind of agent selected from glycerin, propyleneglycol and ethyleneglycol of 200 to 600 average molecule weight are added as a humectant is used. Pulran is dissolved into said main aqueous solution, and in this case, when the water content of mixed solution of sodium lactate and humectant is from 40 to 70 %, the mixture shows very good lubricating effect. However, when the water contents is smaller than 40 wt%, the penetration to the wound up part of a condom is not sufficient, and when it is bigger than 70 wt% the surface appearance of a condom becomes white. As a water soluble lubricant, a main aqueous solution composed by trimethylglycine to which at least one kind of agent selected from glycerin and propyleneglycol are added as a humectant is used. Pluran is dissolved into said main aqueous solution, and in this case, when the water content of mixed solution of trimethylglycine and humectant is from 40 to 70 %, the mixture shows very good lubrication. However, when the water contents is smaller than 40 wt%, the penetration to the wound up part of a condom is not sufficient, and when it is bigger than 70 wt% the surface appearance of a condom becomes white. As a water soluble lubricant, glycerin alone is added as a humectant to the aqueous solution of sodium lactate, and in this case, when the added amount is from 5 to 50 wt% to the aqueous solution of sodium lactate, the mixture shows very good wettability. However, when the mixing ratio is smaller than 5 wt%, the wettability is not sufficient, and when it is bigger than 50 wt%, the penetration to the wound up part of a condom is not sufficient As a water soluble lubricant, glycerin alone is mixed with the aqueous solution of trimethylglycine, and in this case, when the added amount is from 5 to 50 wt% to the aqueous solution of trimethylglycine, the mixture shows very good wettability. However, when the mixing ratio is smaller than 5 wt%, the wettability is not sufficient, and when it is bigger than 50 wt%, the penetration to the wound up part of a condom is not sufficient. As a water soluble lubricant, propyleneglycol alone is mixed with the aqueous solution of sodium lactate, and in this case, when the added amount is from 5 to 50 wt% to the aqueous solution of sodium lactate, the mixture shows very good wettability. However, when the mixing ratio is smaller than 5 wt%, the wettability is not sufficient, and when it is bigger than 50 wt%, the penetration to the wound up part of a condom is not sufficient. As a water soluble lubricant, propyleneglycol alone is mixed with the aqueous solution of trimethylglycine, and in this case, when the added amount is from 5 to 50 wt% to the aqueous solution of trimethylglycine, the mixture shows very good wettability. However, when the mixing ratio is smaller than 5 wt%, the wettability is not sufficient, and when it is bigger than 50 wt%, the penetration to the wound up part of a condom is not sufficient As the water soluble lubricant, a main aqueous solution composed by sodium lactate to which at least one kind of agent selected from glycerin, propyleneglycol and ethyleneglycol of 200 to 600 average molecule weight are added as a humectant is used. Pluran is dissolved in said aqueous solution, and in this case, when the dissolving amount is from 0.5 to 5.0 wt% to the aqueous solution composed by sodium lactate and a humectant, the mixture shows an excellent lubricating effect. However, when the dissolving ratio is smaller than 0.5 wt%, the penetration to the wound up part of a condom is not sufficient, and when it is bigger than 5.0 wt% the penetration to the wound up part of a condom is not sufficient. As the water soluble lubricant, a main aqueous solution composed by trimethylglycine to which at least one kind of agent selected from glycerin, propyleneglycol and ethyleneglycol of 200 to 600 average molecule weight are added as a humectant is used. Pluran is dissolved in said aqueous solution, and in this case, when the dissolving amount is from 0.5 to 5.0 wt% to the aqueous solution composed by trimethylglycine and a humectant, the mixture shows an excellent lubricating effect. However, when the dissolving ratio is smaller than 0.5 wt%, the penetration to the wound up part of a condom is not sufficient, and when it is bigger than 5.0 wt% the penetration to the wound up part of a condom is not sufficient. When a water soluble penetrating agent to the wound up part of condom or a humectant are composed by mixing a plurality of agent, it is confirmed that by controlling the mixing amount of each agents within the region from 0 (zero) to the maximum soluble amount of single use of these agents, a lubricant having good penetration to the wound up part of condom and good wettability can be obtained. EXAMPLES The invention will be understood more readly with reference to the following Examples, however these Examples are intended to illustrate the invention and are not to be construed to limit the scope of the invention. Example 1 Table 1 to 9 show the results from confirmation experiments of the penetration effect to the wound up part of condom referring to the water soluble lubricant for condom of this invention, and in table 1 a mixing ratio of the penetration agents used in each experiments with the sliminess agent are indicated. Table 2, 3, 4, 5, 6, 7 and 8 show the number of days to penetrate into the wound up part of condom of lubricants which uses as a penetration agent an aqueous solution of sodium lactate (table 2), trimethylglycine (table 3), mixture of sodium lactate and trimethylglycine (table 4), sodium dl-pyrrolidonecarboxylic acid (table 5), xylose (table 6), xylitol (table 7) and sodium dl-malate (table 8) and to which a sliminess agent is preferably added. These results show that the lubricants of this invention can remarkably decrease the number of days to penetrate into the wound up part of condom compared with the conventional lubricant composed by lipophilic type agents such as silicone oil. Example 2 Table 10 to 12 show the results from confirmation experiments of the penetration effect to the wound up part of condom referring to the water soluble lubricant for condom of this invention. Table 10 and 11 show the number of days to penetrate into the wound up part of condom of lubricants which uses an aqueous solution of sodium lactate (table 10) and trimethylglycine (table 11) as a penetration agent, to which glycerin and propyleneglycol as a humectant and pullulan as a sliminess agent are added. Table 12 shows the results by comparative experiment using silicone oil as a lubricant. These results show that the lubricants of this invention can remarkably decrease the number of days to penetrate into the wound up part of condom compared with the conventional lubricant composed by an oily type agent such as silicone oil. EFFECT OF THE INVENTION As explained in the detailed description of the invention and Examples, by combining a water soluble penetrating agent which have good penetration to the wound up part of condom, a humectant which provides a condom with good wettability and a water soluble sliminess agent which provide a condom with sliminess at actual use, a water soluble lubricant for condom which can be easily removed by water when adhered to skin, does not whiten the appearance of a condom, further have a good penetration to the wound up part of condom, and a condom whose surface is spread with said water soluble lubricant can be prepared.

Claims: A water soluble lubricant for condom comprises a sliminess agent wherein the sliminess agent is at least one kind of agent selected from the group composed by pullulan, ammonium polyacrylate, ammonium-polymetacrylate, arabian gum, dextran, tamarindo gum, furcelleran, sodium-starch glycollic acid, sodium-polyacrylate and polyvinyl-pyrrolidone and a penetrating agent wherein the penetrating agent is at least one kind of agent selected from the group composed by sodium-lactate, trimethylglycine, sodium-dl-malate, monosaccharide, salt of dl-pyrrolidonecarboxylic acid and sugar alcohol. A water soluble lubricant for condom according to claim 1, further comprising a humectant wherein the humectant is at least one kind of agent selected from the group composed by glycerin, propyleneglycol and ethyleneglycol of 200 to 600 average molecule weight. A condom whose surface is spread with the water soluble lubricant of claim 1 or 2.

Inventors: TSUSHIMA KYOGO, TSUSHIMA, KYOGO, Tsushima, Kyogo, Ibaraki Fac.
Applicants: OKAMOTO IND INC, OKAMOTO INDUSTRIES, INC.
Application year: 1997
Main classification: A61L31
IPC codes: A61F6