Appeal No. 2004-2219 Page 2
Application No. 09/927,009
INTRODUCTION
The claims are directed to a method for forming a moisture reactive hot melt adhesive and
the adhesive formed thereby. Claim 1 is illustrative of the method:
1. A method for forming a moisture reactive hot melt adhesive comprising
a) forming a hydroxyl-functional prepolymer by reacting first components comprising a
polyol selected from the group consisting of polyether polyols, polyester polyols, and
mixtures thereof, said polyol having a weight average molecular weight of from 250
to 5,000; and a polyisocyanate, the ratio of OH/NCO groups of said first components
on an equivalents basis being from 1.05 to 3.0;
b) admixing second components comprising said hydroxyl-functional prepolymer, a
polyol selected from the group consisting of polyether polyols, polyester polyols, and
mixtures thereof, and a polyisocyanate, the weight ratio of said hydroxyl-functional
prepolymer to said polyol being from 9/1 to 1/9, and the ratio of NCO/OH groups of
said second components on an equivalents basis being from 1.5 to 2.2; and
c) reacting, or allowing to react, said admixture.
The Examiner maintains rejections under 35 U.S.C. §§ 102(e) and 103(a). As evidence
of unpatentability, the Examiner relies upon the following prior art references:
Anderson et al. (Anderson) 5,939,499 Apr. 17, 1999
Graham 6,365,700 Apr. 2, 2002
Claims 1-3 stand rejected under 35 U.S.C. § 102(e) as anticipated by Graham. Claims 1-
3 also stand rejected under 35 U.S.C. § 103(a) as obvious over Graham. Claim 4 stands rejected
under 35 U.S.C. § 103(a) as being unpatentable over Graham in view of Anderson.
We reverse with regard to the rejection under 35 U.S.C. § 102, but we affirm with regard
to the rejections under 35 U.S.C. § 103. Our reasons follow.
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