Surface improver for reinforced composite compositions
View Patent ↗The invention is a composition comprising a blend of two or more epoxide containing compositions selected from epoxidized vegetable oils, epoxidized alkyl esters or cycloaliphatic epoxides. In another embodiment, the invention is a blend of one or more epoxidized vegetable oils, epoxidized alkyl esters, or cycloaliphatic epoxides with one or more aromatic epoxides or epoxy functionalized polyoxyalkylene polyols.
1. A surface improver composition for unsaturated thermosetting resin compositions, the surface improver composition comprising an epoxy resin composition having a blend of epoxidized linseed oil and octyl epoxytallate having a ratio of epoxidized linseed oil:octyl epoxytallate of 3:1 to 1:3, a thermoplastic additive comprising a thermoplastic polymer, and a compound capable of dissolving the thermoplastic additive and epoxy composition.
2. The surface improver composition of claim 1 wherein the compound capable of dissolving the thermoplastic resin and epoxy composition is a cross linking monomer capable of copolymerizing with unsaturated thermosetting resins.
3. The surface improver composition of claim 2 wherein the thermoplastic additive is present in an amount of 12 to 35 parts by weight, the epoxy composition is present in an amount of 1 part to 25 parts by weight and the cross linking monomer is present in an amount of 40 parts to 87 parts by weight wherein there are a total of 100 parts by weight.
4. The surface improver composition of claim 1 wherein the ratio of epoxidized linseed oil:octyl epoxytallate is 1:1.
5. The surface improver composition of claim 1 having an oxirane number of 8.8 or less and a viscosity of 1000 cps (1.0 Pas) or less.
6. An unsaturated thermosetting resin composition comprising: a) one or more unsaturated thermosetting resins; b) one or more cross linking monomers; and c) a surface improver composition according to claim 1 .
7. The composition of claim 6 wherein the surface improver composition comprises 25 to 45 parts of 100 parts of components a), b) and c).
8. Molded parts comprising the composition of claim 6 wherein the surface of the molded object has improved surface smoothness as compared to molded parts which do not contain part c).