Patent ID: 9273209
Filing Date: 2016-03-01
CPC Classification: C08G,C08K,C08L,G03F

Claim Text:
1. A method of producing a siloxane prepolymer composition capable of forming a film that is completely soluble in an alkaline-aqueous solution and comprising a siloxane prepolymer with a siloxane backbone exhibiting a group which is capable of being deprotonated in an aqueous base solution and further exhibiting two different reactive functional groups, one of which is an active group having a double bond, said siloxane prepolymer having been cross-linked through the active groups by adding a radical initiator during polymerisation to increase the molecular weight thereof, wherein between 25 mol % and 75 mol % of the active groups are crosslinked, a solvent for the siloxane prepolymer, and a photo reactive compound, the method comprising: hydrolysing at least two different silane monomers, one of which silane monomers has a methacrylate group and the other of which has an active functional group different from methacrylate, condensating the silane monomers to form a siloxane prepolymer having a molecular weight of about 2,000 to 20,000 g/mol, partially cross-linking the siloxane prepolymer through the methacrylate groups using a radical initiator, and incorporating a photo reactive compound and a solvent for the siloxane prepolymer, in order to formulate a siloxane prepolymer liquid composition.