Molding compounds comprising a mixture of block copolymers employed as a modifier for thermosetting unsaturated polyester resin compositions
AssigneeShell Oil Company
InventorsWilliam P. Gergen, Walter M. Halper
Life of this patent
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Abstract
The invention relates to molding compounds modified with a high 1,2 unsaturated carboxylated styrene-butadiene block polymer and a saturated styrene-alpha-olefin block polymer, said molding compounds containing an unsaturated crosslinkable resin, ethylenically unsaturated monomer, filler, reinforcing agent, catalyst, and thickener.
Claims19
A molding compound modifier combination comprising (a) between about 10 and 90% w of a normally solid, carboxy-containing polymer comprising the mixture of structures ##STR5## where P- is a styrene-butadiene block copolymer with the butadiene portion having a microstructure of between about 30 and about 40 mol percent 1,2-vinyl, between about 20 and about 30 mol percent 1,4-cis and between about 30 and about 50 mol percent 1,4-trans and (b) between 90 and 10% w of a block copolymer having the general formula
- (A--B).sub.n
- wherein A is a block of the group consisting of polystyrene polymer blocks and hydrogenation products thereof having an average molecular weight between about 5,000 and 50,000, B is a polymer block of the group consisting of alpha olefin polymer, conjugated diene polymers, and hydrogenated conjugated diene polymer wherein at least 50% of the original olefinic double bonds have been reduced by hydrogenation said block having average molecular weight between about 10,000 and 1,000,000 and n is an integer between 1 and 25.
A moldable composition having improved surface smoothness and gloss comprising:
- (a) an unsaturated, crosslinkable thermosetting resin;
- (b) an ethylenically unsaturated monomer;
- (c) an additive selected from the group consisting of reinforcing agents, fillers and mixtures thereof;
- and
- (d) a combination of modifiers comprising (a) between about 10 and about 90% w of a normally solid, carboxy-containing polymer comprising the mixture of structures ##STR6## where P-- is a styrene-butadiene block copolymer with the butadiene portion having a microstructure of between about 30 and about 40 mol percent 1,2-vinyl, between about 20 and about 30 mol percent 1,4-cis and between about 30 and about 50 mol percent 1,4-trans and (b) between about 90 and about 10% w of a block copolymer having the general formula
- (A-B).sub.n
- wherein A is a block of the group consisting of polystyrene polymer blocks and hydrogenation products thereof having an average molecular weight between about 5,000 and 50,000, B is a polymer block of the group consisting of alpha olefin polymer, conjugated diene polymers, and hydrogenated conjugated diene polymer wherein at least 50% of the original olefinic double bonds have been reduced by hydrogenation said block having average molecular weight between about 10,000 and 1,000,000 and n is an integer between 1 and 25.
Dependencies are inferred from the claim text.