MANUFACTURED ARTICLES COATED WITH OLEFINIC POLYMERS AND PROCESS FOR THEIR PREPARATION

Abstract: Manufacture articles in the form of sheets coated with a composition consisting of: a) from 75 to 99 parts by weight of a polypropylenic material of melt index comprised between 5 and 60, con­ sisting of a prevailingly isotactic polymer of propylene; b) from 1 to 25 parts b.w. of polyethylene having a density comprising between 0.910 and 0.935, having a melt index comprised between 1 and 10, or of an ethylene-­ propylene copolymer of the amorphous type, having a melt index comprised between 1 and 50; c) from 0.01 to 0.2 parts b.w. on 100 parts of polyme­ ric composition of an organic sulphide of formula: A-S-B wherein A and B, equal to or different from each other, are aryl, alkyl, alkylaryl groups, at least one of the groups A and B being an aryl containing a functional hydroxyl group in position 2 or 4 with respect to S, and at least one linear or branched alkyl group.

Description: DES CRIP T ION of an invention having for a title: "MANUFACTURED ARTICLES COATED WITH OLEFINIC POLYMERS AND PROCESS FOR THEIR PREPARATION., The present invention concerns manufactured articles in the form of sheets coated with olefinic polymers, and the process for their preparation. More particularly, the invention relates to the coating of paper, aluminum, fabrics of either fibrilled or unfibrilled polyolefinic fabrics and the like, with the polyolefini com positions object of this invention. In previous patents in the name of the same Applicant as well as of others, there have been described processes that consist in coating supports, essentially consisting of polyolefine films, with polyolefinic compositions, in order to make the films thermoweldable and impermeable. The coating of paper, aluminum, fabrics of fibrilledor unfibriled polyolefinic film and the like, with mixtures of polyolefines, is however, quite difficult. As a matter of fact, if the coating of different supports by means of the extrusion-coating technique, is carried out using as a coating polyolefinic mixtures, the process is disturbed by irregularities in the flow of the molten coating material, irregularities that influence negatively the final characteristics of the product and considerably reduce the winding up speed of coated manufactured articles obtained as a continuous sheet. We have now found, and this forms the object of this invention, that it is possible to obtain manufactured articles in the form of sheets, consisting of paper, aluminum, fabrics of polyolefinic films, either fibrilled or un fibrilled, and the like, coated with mixtures of polyolefines, by a process in which the previously described drawbacks do not occur. Operating according to the extrusion coating tech nique according to this invention, the flow of the molten coating material is regular, the windinp speed of the ma nufactured articles is rather high while the articles them selves display such characteristics as to be suited for use in numerous fields of use. The supports used according to this invention consist of paper of the Kraft type, imitation parchment (parchment pa per), glassine and the like, aluminum foils, also coupled with other different materials such as for instance paper and plastic films, fabrics made of polyolefinic films, ei thet fibrilled or unfibrilled, obtained by either flat or tubular film extruding of polyolefines or mixtures thereof, possibly additioned with stabilizers, dyeing pigments, either organic or inorganic, lubricants, opacizers, antistatic agents and the likes. The film-forming is followed by longitudinal drawing and cutting of the film by known methods. The coatings according to this invention are obtained by using a composition consisting of: a) a prevailingly isotactic propylene polymer or a propylene -ethylene copolymer.of the "random" type, crystalline and containing up to 6% by weight of ethylene, or polymer mixtures containing prevailingly isotactic polypropylene by obtained/polymerization in at least two stages, with ste reospecific catalysts, of propylene and subsequently of ethy lene'and/or of an ethylene-propylene mixture, so as to ob tain a polymerization product containing up to 20% b.w. of methylene. In any case, the polyolefinic material has a melt index comprised between 5 and 60, and is used in a proportion of 75% - 99% by weight on the total weight of the composition. b) a polymer of ethylene, having a density comprised between 0.910 and 0.935, prepared with radicalic catalysts and showing a melt index comprised between 1 and 10, or an ethylene-propylene copolymer of the amorphous type,having a content in ethylene of 20-50 and a melt index compri sed between 1 and 50, said compounds being used in a pro portion of 1% - 25% on the total weight of the mix. c) an organic compound of the formula A-S-B wherein A and B, equal to or different from each other, are aryl, alkyl, alkylaryl groups, at least one of the groups A and B being an aryl containing a functional thy- droxyl group in position 2 or 4 with respect to S, and at least an alkyl group, either linear or branched. This or ganic sulphide is used in a proportion of 0.01%-0.2% b.w. -O- on the total weight of the mix. Particularly useful for the purpose are: 4,4r-thio-bis (6-tert,butyl-m.cresol), (4-hydroxy-3,5-di-tert. butyl benzyl (octadecylacetate)sulphide and the likes. The above said organic sulphides have the function of regulating the flow of the molten polydlefinic coating mate rial. Said sulphides allow a regular and fast flow of the molten polymer, during the extrusion-coating operation. The manufatcured articles according to this invention are prepared by means of known techniques, by the extrusion coating method. The use of mixes according to this invention allows regular flows of the molten coating material, high windin Wp speeds and good characteristics of the manufactured articles, and more particularly it makes it possible to obtain thin coatings with a uniform and constant thickness. The products thus obtained, show high characteristics of impermeability to gases, vapors oils and the likes, good thermoweldability properties, and they find a use in the pro of duction/materials for packaging of either liquid, solid and powdery products, for foodstuffs and the like. To the coating mixture according to this invention there may be added small quantities of stabilizers, opacizers, plasticizers, organic and inorganic dyeing pigments, lubri cants, antistatic agents and the likes0 The permeability to wat err vapour (steam) has been evalu ated according to ASTM E 96 standards, the permeability to other gases according to ASTM D 1434 standards, both at 250C. In practice Xo this invention may be introduced a large numbs of variations and changes, without, however, falling outside the spirit and scope of this invention. In the following will now be given a set of examples for merely illustrative and not limiting purposes. EXAMPLE 1 A coated manufactured article was prepared by extrusion on a Kraft type paper support, of a blend consisting of: - granulated polypropylene,having a melt index of 15, a re sidue at the heptanic extraction of 97.3% and ashes content equal Ao 72 ppm, prepared by stereospecific polymerization of propylene: 47.5 Kg. - granulated polyethylene, having a melt index of 4, a den sity equal to 0,918 and ashes equal to 48 ppm, prepared by polymerization of the ethylene with radical catalysts: 2.5 Kg. - 4, 4'-thiobis(6-tert.butyl-m-cresol), 0.05 Kg. The support consists of Kraft type paper having a width fo 30 cm and a weight of 60 g/sq.mt. The extrusion of the coating blend or mixture on the support is carried out by means of conventional equipment, that is, of the type used for extrusion coating on an extruder with a flat nozzle, under the following operational conditions: - temperature of extrusion head (in OC) 300 - winding up speed of the coated manufac tured article (in (m/min.) 140 The manufactured article thus obtained showed the following characteristics: - thickness of the coating (micron) : 25.5 - weight of the coating (g/sq.mt): 23 - permeability to oxygen (cc/sq.mt/24 hrs/atm.) : 30 - permeability to carbon dioxide (ccjsq.mt/24 hrs.atm) : 130 - permeability to water vapour (steam): (gr/sq.mt/24 hrs.) 1 - weldability range (in Oc) : 130-135 and it proved particularly suited for use in the packing of oily products. EXAMPLE 2 A coated manufactured article was prepared by extrusion on a Kraft-type paper support, of a blend consisting of: - polypropylene-in granules, having a melt index equal to 15, a residue at the heptanic extraction = 9703%, ashes = 72 ppm, prepared by stereo specific polymerization of the pro pylene: 44 Kg. - granulated polyethylene, having a melt index equal to 4, a density of 0.918 and ashes equal to 48 ppm, preparedbgr polymerization of ethylene with radicalic catalysts; 6 kg. - 4, 4'-thiobis(6-tert.butyl-m-cresol) t 0.05 Kg. The support consisted of Kraft-type paper, 30 cm wide and having a specific weight of 60 g/sq.mt. The extrusion of the coating blend on the support is carried out on conventional equipment, that is, of the type used for extrusion coating, with an extruder with a flat nozzle, under the following working conditions: - temperature of extrusion head (?C) : 300 - widing up speed of the coated article (mt/min.): 200 The obtained manufacture article showed the following cha racteristics: - thickness of the coating (microns) : 7.5 - weight of the coating (g/sq.mt) : 6.7 - permeability to oxygen (cc/sq.mt/24 hrs.atm): 35 - permeability to carbon dioxide (cc/sq.mt/24 hrs.atm)l40 - permeability to water vapour (g/sq.mt/24 hrs): 1.5 - range of weldability (OC) : 125-130 and it proved particularly suited for use as material for heat-welded packages for holding productslspoilable by moisture. EXAMPLE 3 There was prepared a coated manufactured article, by means of extrusion of a Kraft-type paper support of a mix consis ting of: - polypropylene in granules, having a melt index 15, a residue at the heptanic extraction equal to 97.3%, ashes equal to 72 ppm; prepared by stereospecific polymeriza tion of the propylene, 37.5 kg. - polyethylene in granules, having a melt index of 4, a density = 0.918, ashes equal to 48 ppm; prepared by po lymerization of the ethylene with radicalic catalysts, Kg. 12.5. - 4,4'-thiobis(6-tert.butyl-m-cresol\, Kg. 0.05. the support consisted of Kraft-type paper 30 cm wide and with a specific weight of 60 g/sq.mt. The extrusion of the coating mix onto the support is carried out by means of traditional devices of the type used for the extrusion coating, with an extruder with a flat nozzle, under the following working conditions: - temperature of extrusion head (in OC) 292 - winding up speed of the coated manufactured article (in mt/min. ) 210 The manufactured article thus obtained showed the fol lowing characteristics: - thickness of coating (micron) : 10.5 - weight of coating (g/sq.mt) : 9.5 - permeability to oxygen (cc/sq.mtg24 hrs/atm) : 30 - permeability to carbon dioxide (g/sq.mt/24 hrs/atm) : 130 - permeability to water vapor (g/sq.mt/24 hrs) : 1.2 - weldability range (in OC) . 115-125 and it proved particularly suited for use as packaging material for foodstuffs that has to be subjected to steri lization at high temperatures. EXAMPLE 4 There was prepared a coated manufactured article, by extrusion onto Kraft-type paper support of a blend consisting of: - polypropylene in granules, having a melt index of 14, a residue to heptanic extraction = 97.6%, ashes equal to 67 ppm; prepared by stereospecific polymerization of the propylene: 45 kg. - polyethylene in granules, having a melt index equal to 3, density equal to 0.921, ashes = 51 ppm, prepared by poly merizing ethylene with radicalic catalysts, Kg. 5.0. (4-hydroxy-3,5-di-t-butylbenzyl)(octadecylacetate) sul phide; Kg. 5.0. The support consisted of Kraft-type paper 120 cm wide and having a specific weight of 100 g/sq.mt. The extrusion of the coating blend onto the support id carried out by means of conventional devices of the type used for the extrusion coating, with an extruder with a flat nozzle, under the fol lowing working conditions: - temperature of extrusion head (in OC) : 270 - winding up speed of coated article (mt/min.): 190 The manufactured article thus obtained showed the fol lowing characteristics: - thickness of coating (micron) : 15 - weight of coating (g.sq.mt)) : 13.5 - permeability to oxygen (cc/sq.mt/24 hrs.atm) : 35 - permeability to carbon dioxide (cc/sq.mt/24 hrs.atm) : 140 - permeability to water vapor (g/sq.mt/24 hours) : 1.5 - weldability range ( ( C ) ) , 122-128 and it proved particularly suited for use in the foodstuff packaging field -EXAMPLE 5 There was prepared a coated-manufactured article by extruding, on a support consisting of fabric of non-fibril led polyolefinic film,a blend consisting of: - polypropylene in granules, having a melt index = 30, a re sidue at heptanic extraction equal to 96.9%, ashes equal to 63 ppm, and prepared by stereospecific polymerization of propylene, Kg. 88. - polyethylene in granules, having a melt index of 4, a den ;3ity equal tg 0.918, ashes equal to 48 ppm, and prepared by polymerizing ethylene with radicalic catalysts, Kg. 12. - 4,4-fthiobis(6-tert.butyl-m-cresol), Kg. 0.150. The support cdnsisted of a fabric of non-fibrilled polypro pylenic film, prepared by weaving on a flat loom and showing a specific weight of 80 g/sq.mt. It was obtained starting from a tubular film of polypropylene having a melt index of 2, a residue at hepta nic extraction equal to 97.3%, ashes = 55 ppm, stretched in a longitudinal direction with a stretch ratio = 1:7, at a temperature of 1400C, in order to obtain a thickness of 30, The extrusion of the coating mix onto the support was carried out by means of conventional devices of the type used for extrusion coating, with the extruder having a flat nozzle, under the following operational conditions: - temperature of the extrusion head (OC) 285 - winding up speed of coated manufactured article (mt/min.) 110 Whe manufactured article thus obtained showed the follow in characteristics: : - thickness of coating (micron) 24.5 - weight of coating (g/sq.mt) 22 - permeability to oxygen (cc/sq.mt.24 hrs.atm) 35 - permeability to carbon dioxide (cc/sq.mt./24 hrs.atm) 145 - weldability range (in OC) 122-128 and it proved particularly suited for use as a material for the production of heat-welded or stitched bags for powdery chemicals. EXAMPLE 6 There was prepared a coated manufactured article by extrudingon a support of fabric made of non-fibrilled po lyolefinic film, of a coating mix consisting of: - polypropylene in granules, having a melt index of 15, a residue at heptanic extraction equal to 97/3 and ashes equal to 72 ppm, prepared by stereospecific poly merization of the propylene, Kg. 88. - polyethylene in granules having a melt index of 4, a den sity equal to 0.918 and ashes = 48 ppm, prepared by po lymerization of ethylene with radicalic catalysts, Kg.1-2.- - 4,4'-thiobis(6-tert.butyl-m-cresol, Kg. 0.150. The support consistsd of a fabric of non-fibrilledpo lypropylene film, prepared by weaving on a tübul r:-loom, and showing 8 specific weight of 70 g/sq.mt and with a se mi-circumference of 78.5 cm. The extrusion of the coating mix onto the support is carried out by means of conventional equipment, of the type used for extrusion coating, under the following working conditions: - temperature of extrusion head (Ce) 305 - winding up speed of the coatedemanufactured article (mt/min.) 100 The manufactured article thus obtained showed the fol lowing characteristics: thickness of the coating (in microns) 20 - weight of the coating (g/sq.mt) 18 - permeability to oxygen (cc/sq,mt.24 hrs.atm) : 35 - permeability to carbon dioxide (cc/sq.mt.24 hrs.atm) : 140 - permeability to water vapor (g/sq.mt. 24 hrs) 1 - weldability range (in Oc) 125-130 and it proved particularly suited for use as a material for the production of bags for the transportation of che mical products and foodstuffs. EXAMPLE 7 There was prepared a coated manufactured article by extrusion on a support, made of a fabric of non-fibrilled polyolefinic film, of a blend consisting of: - polypropylene in granules, having a melt index of 30, a residue at heptanic extraction equal to 96.9%, ashes equal to 63 ppm, prepared by stereospeciEic polymerization of ethylene with radicalic catalysts, Kg. 12. - (4-hydroxy-3,5-di-t-butylbenzyl).(octadecylacetate)sulphide, Kg. 0.05. The support consisted of a fabric of non-fibrilled polyolefinic film, prepared by weaving on a flat loom and showed a specific weight of: 60 g/sq.mt. The extrusion of the coating mix onto the support was carried out by means of conventional equipment of the type used for extrusion coating under the following operational conditions: - temperature of extrusion head (in OC) 280 - winding up speed of the coated manufactured article (mt/min.) 105 The manufactured article thus obtained, showed the follow ing characteristics: - thickness of the coating (micron) : 16.7 - specific weight of the coating (g/sq.mt) : 15 - permeability to oxygen (cc/sq.mt.24 hrs.atm) :35 - permeability to carbon dioxide (cc/sq.mt.24 hrs.atm) : t45 - permeability to water vapor (steam) (g/sq.mt/24 hours) i 2 - weldability range (in OC) : 122-128 and it proved particularly suited for use as impermeable sheet, very resistant for applications in agriculture. EXAMPLE 8 There was prepared a coated manufactured article, by extrusion on a support made of a fabric from non-fibrilled polyolefinic film, of a blend consisting of: - polypropylene in flakes, having a melt index of 25, a re sidue at heptanic extraction equal to 97.9%, ashes equal to 37 ppm, prepared by stereopsecific polymerization of the propylene, Kg. 44; - polyethylene in granules, having a melt index of 4, Åa density equal to 0.918 and ashes equal to 48 ppm, prepared by polymerization of the ethylene with radicalic cata lusts; Kg. 6. - 4, 41-thiobisk6-tert.butyl-m-cresol), Kg. 0.05. The support consisted of a fabric of non-fibrilled po lyolefinic film, prepared by weaving on a tubular loom, and showed a specific weight of 80 g/sq.mt and a semi-circumfe rence of 78.5 cm. The extrusion of the coating mix onto the support was carried out by means of conventional equipment, of the type used for extrusion coating, under the following operational conditions: - temperature of extrusion head (OC) : 310 - winding up speed of the coated article (mt/min.) : 110 The manufactured article thus obtained, showed the follow ing characteristics: - thickness of coating (micron) : 10 - weight of coating (g/sq.mt) 9 - permeability to oxygen (cc/sq.mt.24 hrs.atm) : 35 - permeability to carbon dioxide (cc/sq.mt.24 hrs.atm) : 145 - permeability to water vapor (steam) (g/sq.mt./24 hrs.) : 2 - weldability range (OC) 122-128 and it proved particularly suited for use as a material for producing bags for the packaging of powdery products or pro ducts suffering humidity. EXAMPLE 9 There was prepared a coated manufactured article by extrusion, on a support of Kraft-type paper, of a mix consisting of: - polyethylene in granules, having a melt index of 4, a den sity equal to 0.918 and ashes = 48 ppm, prepared bypoly- merization of the ethylene with radicalic catalysts;¯Kg. 6. - crystalline, ethylene-propylene copolymer in granules, ha ving the following percentual composition: ethylene =3.8, melt index = 12 and ashes = 73 ppm; Kg. 44. - 4, 41-thiobis(6-tert.butyl-m-cresol), Kg. 0.05. The support consisted of Kraft-type paper 50 cmwide and having a specific weight of 50 g/sq.mt. The extrusion of the coating mix onto the support, is car ried out on conventional equipment, that is, of the type used for extrusion coating, under the following work ing conditions: - temperature of extrusion head (OC) : 300 - winding up speed of coated article (mt/min.) 180 The manufactured article thu obtained, showed the following characteristics: - thickness of the coating (micron) : 9.7 - weight of the coating (g/sq.mt) : 8.7 - permeability to oxygen (cc/sq.mt.24 hrs.atm) : 30 - permeability to carbon dioxide (cc/sq.mt.24 hrs.atm) : 140 - permeability to water vapor (steam) (g/sq.mt/24 hrs.) : 1 - weldability range (OC) 122-126 and it proved particularly suited for the use as material for preparing welded bags for the packaging of foodstuffs to be stored in refrigerators. EXAMPLE 10 There was prepared a coated manufactured article, by means of extrusion on a support, consisting of a fabric of non-fibrilled polyolefinic film, of a mix 'cons is- ting of: - polyethylene in granules, having a melt index = 4, den sity = 0.918 and ashes equal to 48 ppm , prepared by pro lymerization of the ethylene with radicalic catalysts, Kg. 6. - a crystalline ethylene-propylene copolymer in flakes with ethylene = 3.8%, melt index equal to 12 and ashes equal to 73 ppm; Kg. 44. - 4,4'-thiobis(6-tert,butyl-m-cresol) Kg. 0.075. The support consisted of a fabric of non-fibrilledpo lyolefinic film, prepared by weaving on a flat loom and show ing a specific weight of 60 g/sq.m & The extrusion of the coating mix onto-the support was carried out by means of conventional equipment of the type used for the extrusion coating, under the following working - conditions: - temperature of extrusion head (OC) : 295 - winding up speed of coated article (mt/min.) 110 The manufactured article thus obtained showed the fol lowing characteristics: - thickness of coating (micron) : 8.5 - weight of coating (g/sq.mt) : 7.5 - permeability to oxygen (cc/sq.mt.24 his.atm) 35 - permeability to carbon dioxide (cc/sq.mt. 24 hrs.atm) : 140 - permeability to water vapor (steam) g/sq.mt/24 hrs.) : 1 - weldability range (in C) : 120-125 and it proved to be particularly suitable for use as an impermeable sheet, particularly for the protection of ma terials suffering from atmospheric agents. EXAMPLE 11 (comparative ex.) There was prepared a coated manufactured article, by extruding on a Kraft-type paper support a coating mix of the - following composition: - polypropylene in granules, having a melt index = 15 a re sidue at heptanic extraction = 97.3% and ashes = 72 ppm, prepared by stereospecific polymerization of the propy lene; Kg. 47.5. - polyethylene in granules, having a melt index = 4, a den sity = 0.918 and ashes equal to 48 ppm, prepared by poly merizing the ethylene with radicalic catalysts, Kg. 2.5. The support consisted of Kraft-type paper, 30 cm wide and weighing 60 g /sq.mt. The extrusion of the coating mix onto the support was carried out on conventional- equipment, that is of the type used for extrusion coating, under the following work-- ing conditions: - temperature of extrusion head (OC) : 300 - winding up speed of coated article (mt/min.: 40 -The manufactured article thus obtained showed the following characteristics: - thickness of coating (micron) : 60 - specific weight of coating (g/sq.mt) : 50 - permeability to oxygen (cc/sqtst.24 hrs.atm) : 30 - permeability to carbon dioxide (cc/sq.mt. 24 hrs.atm) : 120 - permeability to water vapor (steam) (g/sq.mt/24 hrs) : 0.5 - weldability range (OC) : 135-145 The low winding speed allowed by this formulation, makes the process little suited for pratical industrial application, while the rather high thickness of the coating makes this coupling unsuited for the applivations in dicated in the previous examples. EXAMPLE 12 (comparative) There was prepared a coated manufactured article, by extruding on a support,consisting of a sheet of non-fibril led polyolefinic film, a coating mixture consisting of - polypropylene in granules, having a melt index = 30, a re sidue at heptanic extraction = 96.9% and ashes = 63 ppm, prepared by tereosp ecific polymerization of the propylene, Kg. 88; - polyethylene in granules, having a melt index = 4, a densi ty = 9.918 and ashes = 48 ppm, prepared by polymerization of the ethylene with radicalic catalysts; Kg. 12. The support consisted of a fabric made from non-fibril led poliolefinic film, prepared by waeving on a flat loom, and showed a specific weight of 80 g/sq.mt. For preparing the fabric, polypropylene in granules, ha ving a melt index = 2, a residue at heptanic extraction = = 97.3% and ashes = 55 ppm, was extruded as a flat film which was then stretched in a longitudinal direction, with a stretch ratio = 1:7, at a temperature of 1400C, in order to obtain a 38 micron thick film which was then cut up into strips by passing the film on a bladed roller arranged on the loom. The extrusion of the coating mix onto the support was carried out on conventional equipment, ladder the following opera tional conditions: - temperature of extrusion head ( C) : 280 - winding up speed of coated article (mt/min0): 35 The manufactured articled thus obtained showed the follow ing characteristics: thickness of coating (micron) : 35 - specific weight of coating (g/sq.mt) : 31.5 - permeability to oxygen (cc/sq.mt. 24 hrs.atm) : 35 - permeability to carbon dioxide (cc/sq.mt. 24 hrs0atm) : 125 ¯ permeability to water vapor (steam) (g/sq.mt/24 hrs.) : 0.5 - weldability range (in OC) : 130-135 The low windinWp speed allowed by this formulation, makes this process little suitable for a practical industrial application, while the considerable thickness of the coating makes this coupled product unsuited for the applications indicated in the previous examples.

Claims: C L A I M S 1) Manufactured articles in the form of sheets, consis ting of a support of paper, aluminum, of fabrics of fibrilled or non-fibrilled polyolefinic films, coated with a composition consisting ot: a) from 75 to 99 parts by weight of a polypropylenic material of melt index comprised between 5 and 60, consisting of a preveilingly isotactic polymer of propylene, or of a crystÅalline¯ propylenf-ethylene copolymer bf the "random" type, or of polymeric mix tures containing prevailingly isotactic polypropy lene, obtained by polymerizing in at least two stages with stereospeeific catalysts, propylene and subsequently ethylene and/or an-ethylene-propylene mix ture, so as to obtain a polymerization product con taining up to 20% by weight of ethylene. b) from 1 to 25 parts b.w. of polyethylene having a den sity comprised between 0.910 and 0.935, prepared with radicalic catalysts, having a melt index comprised between 1 and 10,or of an ethylene-propylene copolv mer of the-amorphous type, having a content in ethy lene of 20% - -50% and a melt index comprised between 1 and 50. c)'from 0.01 to 0.2 parts b.w. on 100 parts of polymeric composition of an organic sulphide of formula: A-S-B wherein A and B, equal to or different from each other, are aryl, alkyl, alkylaryl groups, at least one of the groups A and B being an aryl containing a functional hydroxyl group in position 2 or 4with respect to S, and at least one linear or branched al kyl group. 2) Coatéd- manufactur-ed varticles according to claim 1, characterized in that there is used a coating compo sition containing 4, 4'-thiobis(6-ter.butyl-m.cresol) . 3) Coated manufactured articles according to claim 1, cha racterized in that there is used a coating composition containing (4-hydroxy-3 , 5-di-ter .butyl-benzyl) (octade- cylacetate) sulphide. 4) Coated manufactured articles according to claim 1, cha racterized in that a-s suports are used Kraft-type papers, imitation parchment, glassine and the likes. 5) Coated manuiffactured articles, according to claim 1, cha racterized in that as supports are used aluminum sheets, also coupled to different other materials such as paper and plastic films. 6) Coated manufactured articles according to claim i, cha racterized in that as supports are used fabrics made of either flat or tubular filnls,obtained through film-ex truding prevailingly isotactic polypnopy lene, polyethylene, crystalline ethylene-propylene co polymers with a prevailing content of propylene a 7) Process for the preparation of coated manufactured articles according to claim 1, consisting in apply ing to the support the coating composition in a mol ten state, with the extrusion coating method.

Inventors: MARCACCIOLI, ENZO, DR., PIZZO, ANDREA, SPAGNOLI, LEONARDO
Applicants: MONTEDISON S.P.A.
Application year: 1979
Main classification: C08L23
IPC codes: C09D123