Modified acrylic unsaturated polyester resin

A formulation for a resin transfer molding composition comprising:

• (a) about 30 to about 99 weight percent of a resin including,
• (1) about 40 weight percent to about 75 weight percent of an unsaturated polyester, said unsaturated polyester including the product of reacting dicyclopentadiene, an ethylenically unsaturated carboxylic acid moiety and glycol in concentrations of,
• (i) about 5 weight percent to about 45 weight percent glycols, said glycols having a structure defined by:
• H--(OCHR--CH.sub.2).sub.n --OH
• wherein R is H or CH.sub.3 and n is 1-10;
• (ii) about 15 weight percent to about 55 weight percent of an ethylenically unsaturated dicarboxylic acid moiety, said acid moiety selected from the group consisting of maleic anhydride, maleic acid, fumaric acid and mixtures thereof;
• and
• (iii) about 15 weight percent to about 60 weight percent dicyclopentadiene;
• (2) wherein said unsaturated polyester is dissolved in a mixture of about 10 weight percent to about 30 weight percent styrene monomer and about 10 weight percent to about 30 weight percent methylmethacrylate monomer;
• (b) about 0 to about 85 weight percent of a filler;
• (c) about 0 to about 2 weight percent of a promotor;
• and
• (d) about 0 to about 7 weight percent of an initiator.

A formulation for a resin transfer molding composition comprising:

• (a) about 20 to about 99 weight percent of a resin, said resin including,
• (1) about 40 weight percent to about 75 weight percent of an unsaturated polyester, said unsaturated polyester including the product of reacting dicyclopentadiene, an ethylenically unsaturated carboxylic acid moiety and glycol in concentrations of,
• (i) about 5 weight percent to about 45 weight percent glycols, said glycols having a structure defined by:
• H--(OCHR--CH.sub.2).sub.n --OH
• wherein R is H or CH.sub.3 and n is 1-10;
• (ii) about 15 weight percent to about 55 weight percent of a ethylenically unsaturated dicarboxylic acid moiety, said acid moiety selected from the group consisting of maleic anhydride, maleic acid, fumaric acid and mixtures thereof;
• and
• (iii) about 15 weight percent to about 60 weight percent dicyclopentadiene;
• (2) wherein said unsaturated polyester is dissolved in a mixture of about 10 weight percent to about 30 weight percent styrene monomer and about 10 weight percent to about 30 weight percent methylmethacrylate monomer;
• (b) about 0 to about 85 weight percent of a filler;
• (c) about 0 to about 2 weight percent of a promotor;
• and
• (d) about 0.3 to about 7 weight percent of an initiator.