US 11,732,076 B2 · Cyclic diene-based copolymers

Abstract

Disclosed herein are copolymers formed by cationic polymerization of one or more cyclic dienes and a comonomer selected from the group consisting of a monoterpene, a branched styrene, and combinations thereof, in the presence of a catalyst. Random copolymers having repeat units derived from a cyclic conjugated diene, such as 1,3-cyclohexadiene, and a comonomer such as a monoterpene, can be prepared as soluble products in hydrocarbon solvents. The copolymers can be crosslinked with various crosslinking agents to form materials having good oxidative stability and fire retardancy. The uncrosslinked and crosslinked copolymers have useful properties such as a low dissipation factor, low dielectric constants, and a good balance of thermomechanical and electrical properties that make them valuable in electronic applications.

Claims20

Dependent claims

A copolymer formed by cationic polymerization of one or more cyclic dienes, and a comonomer in the presence of a catalyst, wherein

the comonomer is selected from the group consisting of a monoterpene, a branched styrene, and combinations thereof;
the one or more cyclic dienes is selected from the group consisting of 1,3-cyclohexadiene (CHD), cyclopentadiene (CPD), 1,3-cycloheptadiene, 4,5,6,7-tetrahydroindene, norbornadiene (NBD), and combinations thereof;
the catalyst is selected from the group consisting of a Bronsted acid, a Lewis acid, and combinations thereof;
the copolymer has a Mn of 300-5,000 Dalton and a Mz of 2000-30,000 Dalton;
the copolymer has
(i) a solubility in a hydrocarbon solvent of 0.1 to 2 g of the copolymer per gram of the hydrocarbon solvent, and
(ii) a Tg of 80° C. to 180° C.

4 more elements

Dependencies are inferred from the claim text.

Cyclic diene-based copolymers

Life of this patent

Cyclic diene-based copolymers

Life of this patent

Abstract

Claims20