Patent ID: 9029491
Filing Date: 2015-05-12
Classification: B05D,C08G,C08K,C09D,F24S,F28F,Y10T

Abstract:
1. A cross-linkable coating composition comprising: (i) methyltriethoxysilane, (ii) a polysilane obtainable by reacting (3-aminopropyl) methyldiethoxysilane with a further component selected from the group consisting of 4,4′-methylene bis(cyclohexylisocyanate) and a homopolymer of 1,6-hexamethylene diisocyanate, and where the sum of said silanes constitutes at least 20% of the total mass of the coating composition's combined solids and silanes, and where said silanes are optionally partly or completely hydrolysed and optionally partly condensed; and (iii) at least one low surface energy additive defined by a surface providing a static water contact angle above 90°, wherein (iii.a) the low surface energy additive is obtainable by reacting (3-aminopropyl) methyldiethoxysilane with a silanol terminated polydimethylsiloxane and a further component selected from the group consisting of 4,4′-methylene bis(cyclohexylisocyanate) in the presence of ethanol and 2-propanol as solvents or a composition comprising a homopolymer of 1,6-hexamethylene diisocyanate in the presence of ethanol, ethylacetate and 2-propanol as solvents, (iii.b) said polydimethylsiloxane has in the composition a concentration that upon curing results in 0.01% to 15% of the mass of said cured coating, and (iii.c) said polydimethylsiloxane moiety has a molecular weight of more than 1600 g/mol.