Patent GB-569353-A (GB)
Title: Improvements in and relating to the production of resinoid materials
IPC: C08H1/06
Filed: 1943-03-06
Abstract: Resinoid materials are produced by condensing concentrated fibre-free leather dissolutions, prepared either from chrome leather by means of an acid, or from vegetable tanned leather by boiling in water with the optional addition of acid, or a mixture of such dissolutions, with an aldehyde or its equivalent, such as formaldehyde, paraformaldehyde, hexamine, furfural, oenanthal, croton-aldehyde or p-dimethylamino benzaldehyde.  The product may be utilized as an adhesive in the preparation of laminated paper, textile products, and wood veneers, preferably treating the sheets with the cold mixture and then completing the reaction with heat and pressure.  Modified products, such as sheets for shoe soling, may be obtained by adding, either before or after condensation, plasticizing agents, modifiers and fillers such as stearic acid and its esters, ethylene and other glycols, alkyl and cyclic phthalates, ground cellulose acetate, methyl cellulose gels, synthetic resins, such as phenol formaldehyde moulding powders, rubber, rubber latex, rubber substitutes, such as factice and "Thiokol" (Registered Trade Mark), wood flour, bentonite clay, leather powder, defibrinated leather, protein degradation products, fats, carbon black, zinc oxide, accelerators, vulcanizing agents and pigments.  Phenolic bodies may be added either for antiseptic processing of the waste leather or for additional reactivity with the aldehyde groups.  The leather dissolution and the aldehyde may be condensed at a temperature from 25 DEG  to 100 DEG C., the lower the temperature the lesser the tendency to porosity. By rapid heating to 100 DEG  C., the product becomes more rigid.  The Provisional Specification describes also the use of dissolutions from other protein-containing materials by means of acids, alkalis and biochemical methods.  Asbestos may also be used as a filler. Specification 555,003, [Group VIII], is referred to.ALSO:Resinoid materials are produced by condensing concentrated fibre-free leather dissolutions, prepared either from chrome leather by means of an acid, or from vegetable tanned leather by boiling in water with the optional addition of acid, or a mixture of such dissolutions, with an aldehyde or its equivalent, such as formaldehyde, paraformaldehyde, hexamine, furfural, oenanthal, crotonaldehyde or p-dimethylamino benzaldehyde.  The product may be utilized as an adhesive in the preparation of laminated paper, textile products, and wood veneers, preferably treating the sheets with the cold mixture and then completing the reaction with heat and pressure.  Modified products, such as sheets for shoe soling, may be obtained by adding, either before or after condensation, plasticizing agents, modifiers and fillers such as stearic acid and its esters, ethylene and other glycols, alkyl and cyclic phthalates, ground cellulose acetate, methyl cellulose gels, synthetic resins such as phenol formaldehyde, moulding powders, rubber, rubber latex, rubber substitutes, such as factice and "Thiokol" (Registered Trade Mark), wood flour, bentonite clay, leather powder, defibrinated leather, protein degradation products, fats, carbon black, zinc oxide, accelerations, vulcanizing agents and pigments.  Phenolic bodies may be added either for antiseptic processing of the waste leather or for additional reactivity with the aldehyde groups The leather dissolution and the aldehyde may be condensed at a temperature from 25 DEG  C. to 100 DEG C., the lower the temperature the lesser the tendency to porosity. By rapid heating to 100 DEG  C. the product becomes more rigid.  The Provisional Specification describes also the use of dissolutions from other protein-containing materials by means of acids, alkalis, and biochemical methods.  Asbestos may also be used as a filler. Specification 555,003, [Group VIII], is referred to.