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US 4,376,841 AGranted
Copolymerization of unsaturated polyester resins
AssigneeAkzona Incorporated
InventorLodewijk Roskott
Life of this patent
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Abstract
A process for copolymerizing unsaturated polyester resins is disclosed wherein said resin is copolymerized in the presence of a perketal and an acid or acid-releasing compound.
Claims10
An improved process for copolymerizing an unsaturated polyester resin which comprises an unsaturated polyester and a reactive monomer containing one or more polymerizable CH.dbd.C<
- groups, in which the improvement comprises performing said copolymerization in the presence of a peroxidic initiator comprising from about 0.1 to about 10 percent, by weight, calculated on the total weight of the resin, of a perketal having the structure ##STR3## wherein R, R', R", and R"' are independently selected from the group consisting of substituted or unsubstituted alkyl and aralkyl radicals, the alkyl and aralkyl radicals containing from about 4 to about 12 carbon atoms and R" and R"', along with the central carbon atom, being capable of forming a substituted or unsubstituted cycloalkyl group, and from about 0.001 to about 5 percent, by weight, calculated on the total weight of the resin, of an acid component which is an acid selected from the group consisting of (1) Bronsted acids having a pK.sub.a .ltoreq.formic acid, (2) Lewis acids, (3) metal halides having Lewis acid properties, and (4) acid forming compounds which upon being subjected to solvolysis, heating, or UV radiation, will release a Bronsted acid havng a pK.sub.a <formic acid, selected from the group consisting of triphenyl sulphonium chloride, benzoyl chloride, o-methyl benzoyl chloride, cumyl chloride, and 1,4-bis(.alpha.-chloroisopropyl)benzene.
A copolymerizable storage-stable unsaturated polyester resin comprising a solution of an unsaturated polyester dissolved in from about 30 to about 70 percent of a reactive monomer containing one or more polymerizable CH.sub.2 .dbd.C<
- groups, based on the total weight of the solution, into which has been incorporated from about 0.001 to about 5 percent of an acid selected from the group consisting of (1) Bronsted acids having a pK.sub.a .ltoreq.formic acid, (2) Lewis acids, (3) metal halides having Lewis acid properties, and (4) acid releasing compounds which upon being subjected to solvolysis, heating, or UV radiation, will release a Bronsted acid having a pK.sub.a <formic acid, selected from the group consisting of triphenyl sulphonium chloride, benzoyl chloride, o-methyl benzoyl chloride, cumyl chloride, and 1,4-bis(.alpha.-chloroisopropyl)benzene and from about 0.1 to 10 percent of a perketal having the structure:
- ##STR5## wherein R, R', R", and R"' are independently selected from the group consisting of substituted or unsubstituted alkyl and aralkyl radicals, the alkyl and aralkyl radicals containing from about 4 to about 12 carbon atoms, and R" and R"', along with the central carbon atom, being capable of forming a substituted or unsubstituted cycloalkyl group, both based on the total weight of the polyester resin.
A copolymerizable unsaturated polyester resin comprising:
- a. an unsaturated polyester,
- b. a reactive monomer containing one or more polymerizable CH.sub.2 .dbd.C<
- groups,
- c. from about 0.1 to about 10 percent, by weight, calculated on a total weight of the resin, of a perketal having the structure:
- ##STR6## wherein R, R', R", and R"' are independently selected from the group consisting of substituted or unsubstituted alkyl and aralkyl radicals, the alkyl and aralkyl radicals containing from about 4 to about 12 carbon atoms and R" and R"', along with the central carbon atom, being capable of forming a substituted or unsubstituted cycloalkyl group, and
- d. from about 0.001 to about 5 percent, by weight, calculated on the total weight of the resin, of an acid selected from the group consisting of (1) Bronsted acids having a pK.sub.a .ltoreq.formic acid, (2) Lewis acids, (3) metal halides having Lewis acid properties, and (4) acid forming compounds which upon being subjected to solvolysis, heating, or UV radiation, will release a Bronsted acid having a pK.sub.a <formic acid, selected from the group consisting of triphenyl sulphonium chloride, benzoyl chloride, o-methyl benzoyl chloride, cumyl chloride, and 1,4-bis(.alpha.-chloroisopropyl)benzene.
3 more elements
A copolymerizable unsaturated polyester resin comprising:
- a. an unsaturated polyester,
- b. a reactive monomer containing one or more polymerizable CH.sub.2 .dbd.C<
- groups,
- c. from about 0.1 to about 10 percent, by weight, calculated on a total weight of the resin, of a 1,1-ditertiary butyl peroxy cyclohexane,
- d. from about 0.001 to about 5 percent, by weight, calculated on the total weight of the resin, of an acid selected from the group consisting of (1) Bronsted acids having a pK.sub.a .ltoreq.formic acid, (2) Lewis acids, (3) metal halides having Lewis acid properties, and (4) acid forming compounds which upon being subjected to solvolysis, heating, or UV radiation, will release a Bronsted acid having a pK.sub.a <formic acid, selected from the group consisting of triphenyl sulphonium chloride, benzoyl chloride, o-methyl benzoyl chloride, cumyl chloride, and 1,4-bis(.alpha.-chloroisopropyl)benzene.
2 more elements
A process for accelerating the copolymerization of an unsaturated polyester resin which comprises a solution of an unsaturated polyester in a reactive monomer containing one or more polymerizable CH.sub.2 .dbd.C<
- groups in the presence of from 0.1 to about 10 percent, by weight, calculated on a total weight of the resin, of a perketal having the structure ##STR7## wherein R, R', R", and R"' are independently selected from the group consisting of substituted or unsubstituted alkyl and aralkyl radicals, the alkyl and aralkyl radicals containing from about 4 to about 12 carbon atoms and R" and R"', along with the central carbon atom, being capable of forming a substituted or unsubstituted cycloalkyl group, and further containing a gelation inhibitor, which process comprises incorporating into the resin from about 0.001 to about 5 percent, by weight, calculated on the total weight of the resin, of an acid selected from the group consisting of (1) Bronsted acids having a pK.sub.a .ltoreq.formic acid, (2) Lewis acids, (3) metal halides having Lewis acid properties, and (4) acid forming compounds which upon being subjected to solvolysis, heating, or UV radiation, will release a Bronsted acid having a pK.sub.a <formic acid, selected from the group consisting of triphenyl sulphonium chloride, benzoyl chloride, o-methyl benzoyl chloride, cumyl chloride, and 1,4-bis(.alpha.-chloroisopropyl)benzene.
Dependencies are inferred from the claim text.