| 摘要 |
A reactive polymeric modifier to improve toughness and/or flexibility of thermosetting resins where the polymer has a comb configuration including a saturated polymeric backbone having reactive groups at each end and at least one pendent chain which is miscible with the thermosetting resin while it is uncured; the backbone being a polymeric chain of carbon-carbon linkages free of olefinic unsaturation, having a glass transition temperature Tg in the range from -100 DEG C. to 25 DEG C.; the reactive groups being reactive with the thermosetting resin, being positioned on both ends of the backbone, and comprising, on average, at least 1.2 but less than 2 reactive groups positioned so as to yield a substantially difunctionalized comb; the pendent chain or chains being linked to said backbone, being present in an amount in the range from 3% to 40% by weight of said comb copolymer, and having from 2 to 250 repeating units selected from the group consisting of polyester, polyether, polystyrene, and polymethacrylate; and, the comb polymer having a number average molecular weight in the range from 1,000 to 20,000, and a process for making the modifier.
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