Ultra low loss dielectric thermosetting resin compositions and high performance laminates manufactured therefrom

摘要

A ultra low loss dielectric thermosetting resin composition has at least one cyanate ester component (A) and at least one reactive intermediate component (B) that is capable of copolymerization with said component (A). The invention is a cyanate ester resin of the form: Tn-[W-(Z)f/(H)1−f-W]n−1-[W-(Z)f/(H)1−f-(OCN)f/(R)1−f]n+2, wherein T is a 1,3,5-substituted-triazine moiety (C3N3); W is a linking atom between triazine and either component A or component B; Z is component (A); H is component (B); OCN is a cyanate ester end group; R is a reactive end group of component B; n is an integer greater than or equal to 1; and f is a weight or mole fraction of component A. The composition exhibits excellent dielectric properties and yields a high performance laminate for use in high layer count, multilayer printed circuit board (PCB), prepregs, resin coated copper (RCC), film adhesives, high frequency radomes, radio frequency (RF) laminates and various composites.

主权项

1. A method of making a thermosetting resin composition, comprising the steps of:
a. selecting at least one cyanate ester component (A) b. heating said component (A) to a given temperature for a time period; c. selecting at least one reactive intermediate component (B), said component B being capable of copolymerization with said component (A), said component (B) being a thermoplastic selected from the group consisting of (i) hydroxylated polybutadiene (HPBD) with molecular weights between 100 and 10 000 g/mol, (ii) Hydrogenated hydroxylated polybutadiene (HHPBD), (iii) reactive polydimethylsiloxane (PDMS) with molecular weights between and including 100-20 000 g/mol and at least 2 functional groups per molecule of either hydroxyl or epoxy groups, and (iv) polymethylphenylsiloxane containing between 3-9% OH functional groups; d. heating component (B); e. adding component (B) to component (A) to form a reaction mixture; f. heating said reaction mixture and stirring said reaction mixture to react components together to form a resin; g. monitoring progress of said reaction by monitoring viscosity and refractive index of said resin at a reaction temperature, said reaction being complete when said viscosity of said resin at said reaction temperature is between 100 cP and 200,000 cP, wherein said resin is cooled to stop said reaction to yield a homogeneous resin of the form:
Tn-[W-(Z)f/(H)1−f-W]n−1-[W-(Z)f/(H)1−f-(OCN)f/(R)1−f]n+2  wherein T is a 1,3,5-substituted-triazine moiety (C3N3); W is a linking atom between triazine and either component A or component B; Z is component (A); H is component (B); OCN is cyanate ester end group; R is a reactive end group of component B; n is an integer greater than or equal to 1; and f is a weight or mole fraction of component A; said thermosetting resin composition does not undergo phase separation, but instead forms a neat, homogenous resin consisting of a triazine co-polymer that consists of component (A) and component (B) joined through a triazine moiety.