Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Reexamination Certificate
2006-04-18
2006-04-18
Truong, Duc (Department: 1711)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
C528S162000, C524S858000, C524S871000, C524S873000
Reexamination Certificate
active
07030204
ABSTRACT:
Described are prepolymer compositions on the basis of novolak cyanates of the general formulawherein n is a number from 0 to 20 and the radicals R are identical or different and represent hydrogen or methyl. The compositions contain: 30 to 90 parts by weight of a prepolymer from novolak cyanates (I) wherein R=hydrogen (Ia) and 10 to 70 parts by weight of novolak cyanates (I) wherein R=methyl (Ib), and optionally highly disperse silicon dioxides and/or particulate or fibrous fillers. The inventive compositions are solid at normal temperature and can be ground to flowable powders. They have excellent stability when stored and are easy to process and especially suitable for use as the resin component in base materials for printed circuits on resin-bound abrasive products.
REFERENCES:
patent: 4094852 (1978-06-01), Sundermann et al.
patent: 4713442 (1987-12-01), Woo et al.
Sase et al; Modified cyante ester-based polymer films with—their maunfacture; May 1999; Chem Abstract 130: 353426.
Mizuno et al; Cyanate resin varnishes for printed circuit boards—metal-clad laminates; Oct. 1998; Chem Abstract 129: 331912.
Mizuno et al; Cyanate resin compositions—metal-clad laminates; Oct. 1998; Chem Abstract 129: 331911.
Tsunemi et al; Preparation of—printed circuit laminates; Jun. 1993; Chem Abstract 120; 324905.
A copy of the International Search Report from Applicant's International Applicaiton.
Daum Ulrich
Falchetto Alessandro
Gmur Martin
Hanselmann Paul
Heyl-Frank Brigitta
Fisher Christen & Sabol
Lonza AG
Truong Duc
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