摘要:
Segmented thermoplastic copolyester elastomers containing recurring polymeric long chain ester units derived from phthalic acids and long chain glycols and short chain ester units derived from phthalic acids and 1,4-butanediol or 1,4-butenediol. The elastomers also contain polyvinylpyrrolidone and preferably also contain guanidine stabilizer, phosphorus stabilizer and diphenylamine.
摘要:
Segmented thermoplastic copolyester elastomers containing recurring polymeric long chain ester units derived from phthalic acids and long chain glycols and short chain ester units derived from phthalic acids and 1,4-butanediol or 1,4-butenediol. The elastomers also contain polyvinylpyrrolidone and preferably also contain small amounts of guanidine stabilizer, phosphorus stabilizer and diphenylamine.
摘要:
Segmented thermoplastic copolyester elastomers containing recurring polymeric long chain ester units derived from phthalic acids and long chain glycols and short chain ester units derived from phthalic acids and 1,4-butanediol or 1,4-butenediol. The elastomers also contain polyvinylpyrrolidone and preferably also contain guanidine stabilizer, phosphorus stabilizer and diphenylamine.
摘要:
A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula ##STR1## wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO.sub.2, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the invention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.
摘要:
A castable polyurethane elastomer comprising the polymerization reaction product of a polyurethane prepolymer and 2,3-bis(hydroxymethyl) bicyclo [2,2,1] heptane as a chain extender. The elastomer has an advantageously low rebound property, which makes it particularly useful in shock absorber and anti-vibration mounting applications.
摘要:
This invention relates to copolymerizable ultraviolet light absorber monomers which are .alpha.,.beta.-unsaturated dicarboxylic half-esters of 2-hydroxy,alkoxy,methylolbenzophenone intermediate compounds. The monomers have the formula: ##STR1## where R is alkyl C.sub.1 -C.sub.8, and n is 1 or 2, andY is a half-acyl radical of a .alpha.,.beta.-unsaturated dicarboxylic acid selected from the group of maleic and itaconic acids.The monomers herein are made by monoesterifying intermediate compounds, prepared by converting a 2-hydroxy,alkoxy,benzophenone to the corresponding methylol derivative by a formylation reaction, with the anhydride of the desired acid.In the preferred embodiments of the invention, the alkoxy group is methoxy in the 4-position, the methylol group which is half-esterified is a monomethylol group located at the 3- or 5- position of the phenyl ring containing the hydroxy group, and the acid anhydride is maleic anhydride.Copolymerization of the monomers herein with vinyl monomers provide improved ultraviolet light stable copolymers for industrial and commercial applications.
摘要:
A chain extending agent for reaction injection molding (RIM) comprising a normally liquid blend of butanediol and a toluene diamine mono-substituted with an electron withdrawing group and having the formula ##STR1## wherein X is vicinal to an amino radical and is selected from the group of halogen, CN, NO.sub.2, acyl, carboxylate and isomeric mixtures thereof, and wherein the butanediol and diamine are combined in a critical mole ratio of from 4:1 to about 19:1. The above blend is particularly useful in the preparation of large moldings of polyurethane-polyurea elastomer by the RIM or RRIM (reinforced reaction injection molding) process wherein instant preformed blend is added to a mixture of polyol reactant and catalyst before polymerization in the mold with isocyanate to produce a urethane/urea polymer product of improved properties. Accordingly, the intention also concerns an enhanced RIM or RRIM process and improved product by the use of a mixture of the present chain extender blend and polyol reactant maintainable in the liquid state at ambient temperature.
摘要:
A chalk-adhesion polymer latex for exterior coatings especially suitable for blending with an acrylic formulation, such as vinyl acetate/ acrylic copolymers. The polymer is derived from a monomer precursor composition, including an acrylic moiety, such as an acrylate and a methacrylate, together with small amounts of a nitrogen-containing alkyl acrylate, an acrylamide and propylene glycol. The method of preparing the chalk adhesion polymer includes emulsification stages to accomplish the polymerization.
摘要:
Spreadable thixotropic coating composition suitable for rust removal and containing polyvinylpyrrolidone, water and a thixotropic agent which is either xanthan gum or water-soluble crosslinked interpolymer of maleic anhydride, monovinyl alkyl ether and crosslinking agent. The composition has a pH between about 1.5 and 7.0 is applied to rusty metal surfaces and allowed to dry. During drying the rust becomes incorporated into the coating which is then easily removed.
摘要:
This invention relates to ultraviolet light stable copolymer compositions comprising:(a) a monomer which is an .alpha.,.beta.-unsaturated dicarboxylic half-ester of a 2-hydroxy, alkoxy, methylolbenzophenone, and,(b) a comonomer which is styrene or styrene-butadiene, is described.