| 摘要 |
<p>The present invention relates to polymers having a controlled degradation, consisting of a starting polymer which is selected from the group consisting of polyethylene, polypropylene and ethylene-vinylacetate copolymer, said polymer being added to an olefinically unsaturated compound containing at least two double bonds, having the following general formula: wherein R1, R2, R3, R4, R5, R6, R7 and R8, identical or different represent a hydrogen atom, an alkyl, aryl, cycloalkyl, arylalkyl, or alkylaryl radical; at least one of them with an adjacent radical are divalent radicals which form a ring also containing unsaturations conjugated or not with the unsaturations already present in the olefinically unsaturated compound; A and B are divalent alkyl, aryl, cycloalkyl, arylalkyl or alkylaryl radicals, p and q are 0 or 1; n is 0, or an integer ranging from 1 to 12, n being always zero when no R radical is an aryl radical. The process for producing the new polymers which are degradable through the direct action of the sun light. The improved process eliminates, inter alia, secondary reactions leading to an accelerated photooxidation of the polymer.</p> |
