C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
204/91.45
C08F 2/46 (2006.01) C08F 2/48 (2006.01) C08F 8/00 (2006.01) C08F 20/36 (2006.01) C08J 5/24 (2006.01) G03F 7/027 (2006.01)
Patent
CA 1217453
- 1 - PREPARATION OF PREPREGS FROM CELLULOSIC FIBRES USING WATER-BORNE RESIN COMPOSITIONS ABSTRACT Heat-curable prepregs are made by impregnating cellulosic fibres with a water-borne composition containing (a) a photo- polymerisable resin of specified structure and (b) an epoxide resin, preferably together with a sensitiser for (a) and a heat- hardening agent for (b). Component (a) contains both hydrophobic and hydrophilic units and serves to keep the hydrophobic epoxide resin (b) suspended in the aqueous composition during impregnation, it then solidifying on exposure to actinic radiation. Subsequently the prepregs are heated to cure (b). Component (a) is a di(meth)acrylate containing groups of formula Image or Image where each R19 denotes alkyl or each pair of R19 denotes ?CH2?2, -C(R21R22)CO-, -CH2CH(CH3)-, ?CH2?3, or ?CO?2, R4 denotes a (cyclo)aliphatic or araliphatic radical, - 2 - c and d are each zero or 1, R20 denotes an aliphatic group or, if each d is 1, it may denote Image R21 and R22 each represent -H or alkyl, or, conjointly, a cycloaliphatic ring.
425116
Fetherstonhaugh & Co.
Vantico Ag
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