| 摘要 |
A polymer grafting process in which a Diels Alder adduct is mixed with a polyolefin or vinyl polymer substrate and thermally decomposed to form an ethylenically unsaturated monomer which grafts onto the polymer substrate. The monomer conforms generally to the formula R1R2C=CHR3 in which R1 is hydrogen, methyl or ethyl, R2 is hydrogen, methyl, ethyl or vinyl and R3 is hydroxyl, carboxyl, cyanc, formyl, acetyl or propanoyl. The Diels Alder adduct substantially decomposes at a temperature of 120 to 300.degree.C, but does not substantially decompose below about 120.degree.C. The polymer substrate is preferably high-density polyethylene, low density polyethylene, linear low density polyethylene, ethylene-propylene rubber, propylene, polystyrene or styrene-butadiene block copolymers. The grafting is induced by, for example, heat, catalyst and/or high shear conditions. Optionally, the polymer mixture is devolatilized to 32,836-F remove any unreacted Diels Alder adduct and decomposition products thereof. 32,836-F |
