Appeal No. 1999-0381
Application No. 07/776,014
Claim 1 is illustrative of the claims on appeal:
1. A composition useful as a mold release agent comprising:
(a) 80% to 60% by weight one or more water soluble copolymers of
ethhylene oxide and propylene oxide containing at least 40% and
less than 80% by weight oxyethylene units and exhibiting liquid
phase at ambient temperatures;
(b) 20% to 40% by weight of a crystalline polyoxyethylene glycol
having a melting point slightly above ambient; and
(c) 100 to 5000 ppm of one or more antioxidant additives.
The references relied on by the examiner are:
The Polyglycol Handbook” Dow Chemical Company, pp. 6-28 (1988)
(Handbook)
Kirk-Othmer “Encyclopedia of Chemical Technology,” Vol. 18, pp.
623-624 and pp 637-638 (1982) (Kirk-Othmer)
GROUND OF REJECTION
Claims 1, 3 through 10, 14 and 15 stand rejected under 35 U.S.C. § 103. As
evidence of obviousness, the examiner relies upon the Handbook and Kirk-Othmer.
On consideration of the record, we reverse.
BACKGROUND
The present invention is directed to compositions to be used as "mandrel release
agents” (specification, page 1). According to appellant, there is a need for a release agent
“formulated [to have] the most desirable viscosity at application temperatures and [result] in
a solid film which [is] smooth but [exhibits] no brittleness or cracking” (specification, page
2
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