Patent ID: 6060532
Filing Date: 2000-05-09
Classification: C08F,C08K,C09D

Abstract:
A thermoplastic, elastomeric coating, caulking or sealant composition comprising, as the polymeric binder, an elastomeric multi-stage emulsion polymer obtained by sequentially polymerising, under emulsion polymerisation conditions, a first monomer system free from polyethylenically unsaturated monomers, and which yields a first-stage polymer having a glass transition temperature from about -30.degree. C. to about -60.degree. C., and a second monomer system, likewise free from polyethylenically unsaturated monomers, and which yields a second-stage polymer, incompatible with the first-stage polymer, and having a glass transition temperature from about 0.degree. C. to about 60.degree. C., said multi-stage polymer comprising from about 70% to about 95% by weight of the first-stage polymer and from about 5% to about 30% by weight of the second stage polymer, characterised in that the composition either contains from about 0.1 to about 5.0% by weight, based on the weight of the multistage polymer, a photosensitive benzophenone compound or phenylketone capable of absorbing light of a wavelength falling within that of the visible spectrum, or else comprises, as the said binder, said multistage polymer having incorporated therein, in one or other of the two stages of the multistage polymer, from about 0.5 to about 5.0% by weight, based on the weight of the multistage polymer, of polymerised units derived from a monomer containing a photosensitive benzophenone group.