A method for impact-modifying an unsaturated polyester comprising units derived from polycondensation of maleic anhydride and di(2-hydroxypropyl ether) of bisphenol-A (BPAF), the method comprising: a) adding to a solution of the polyester in a vinyl aromatic monomer, preferably styrene, a multi-stage impact modifier having no reactive functionality, and b) polymerizing the vinyl aromatic monomer to form a cross-linked network in which the impact modifier is present in separate small domains which act as a means for incorporating rubber and toughening the polyester. The multi-stage impact modifier preferably comprises a first-stage core of a crosslinked rubber containing predominantly at least one of a C2 or C8 alkyl ester of acrylic acid or butadiene, and a final shell which predominantly contains methyl methacrylate.
Impact-modified polyester/vynil aromatic compositions
LAZZERI, ANDREA;
1993-01-01
Abstract
A method for impact-modifying an unsaturated polyester comprising units derived from polycondensation of maleic anhydride and di(2-hydroxypropyl ether) of bisphenol-A (BPAF), the method comprising: a) adding to a solution of the polyester in a vinyl aromatic monomer, preferably styrene, a multi-stage impact modifier having no reactive functionality, and b) polymerizing the vinyl aromatic monomer to form a cross-linked network in which the impact modifier is present in separate small domains which act as a means for incorporating rubber and toughening the polyester. The multi-stage impact modifier preferably comprises a first-stage core of a crosslinked rubber containing predominantly at least one of a C2 or C8 alkyl ester of acrylic acid or butadiene, and a final shell which predominantly contains methyl methacrylate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.