Compositions based on unsaturated polyester resins and on new antishrinkage additives
AssigneeCray Valley S.A.
InventorsDominique Fourquier, Laurent Suspene
Life of this patent
Estimating the term…
Abstract
Liquid resinous compositions suitable for the moulding of objects reinforced with glass fibres and capable of being pigmented, comprising an unsaturated polyester, a copolymerisable monomer and a partially hydroxylated alkyl methacrylate polymer. A hydroxylated alkyl methacrylate polymer which is soluble in the monomer and miscible with the unsaturated polyester is chosen. Application to the manufacture of objects moulded by bulk, sheet and injection moulding.
Claims10
A liquid resinous composition comprising an unsaturated polyester, at least one monomer consisting of styrene and/or substituted styrenes and copolymerisable with the unsaturated polyester and an at least partially hydroxylated alkyl methacrylate polymer, wherein said hydroxylated alkyl methacrylate polymer 1) has a molecular weight of between about 1,000 and 20,000 by size exclusion chromatography, 2) is soluble in the monomer and miscible with the unsaturated polyester, and 3) is a copolymer of alkyl methacrylate(s) in which the alkyl group has from 1 to 4 carbon atoms and of unsaturated monomers bearing at least one hydroxyl group.
Dependencies are inferred from the claim text.