The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 15, 1998
Filed:
Aug. 27, 1997
Michael Allen Stanga, Midland, MI (US);
Robert Edward Stevens, Wescosville, PA (US);
Kevin Dale Wiese, Ballwin, MO (US);
Wanda Wells Rauscher, Angleton, TX (US);
Robert H Whitmarsh, Lake Jackson, TX (US);
Vicky Sue Cobb, Elsie, MI (US);
Air Products and Chemical, Inc., Allentown, PA (US);
Abstract
This invention relates to a method for preparing a flexible polyurethane slabstock foam by reacting a polyol, an organic diisocyanate, and water in the presence of at least one urethane catalyst, a siloxane-oxyalkylene copolymer surfactant and, optionally another blowing agent, where the surfactant has the average formula MD.sub.x D'.sub.y M where M is (CH.sub.3).sub.3 SiO.sub.1/2 or R(CH.sub.3).sub.2 SiO.sub.1/2, D is (CH.sub.3).sub.2 SiO.sub.2/2, D' is (CH.sub.3)RSiO.sub.2/2, and the value of x+y is 48 to 220, the ratio x/y is 5 to 15 inclusive, R is a polyether-containing substituent selected from the group consisting of (1) --C.sub.n H.sub.2n O(C.sub.2 H.sub.4 O).sub.a (C.sub.3 H.sub.6 O).sub.b R' group having weight average molecular weights in the range 2300-3400 and wherein n is 3-4, the ratio a/b is from 0.5 to 1.3 inclusive, R' represents hydrogen, an alkyl group of 1-4 carbon atoms or --C(O)CH.sub.3 and (2) --C.sub.n' H.sub.2n' O(C.sub.2 H.sub.4 O).sub.a' (C.sub.3 H.sub.6 O).sub.b' R' group having weight average molecular weights in the range 750-1400 and wherein n' is 3-4, a' is a number such that the ethylene oxide residues constitute 30-100% by weight of the alkylene oxide residues of the polyether, b' is a number such that the propylene oxide residues constitute 0-70% by weight of the alkylene oxide residues of the polyether, R' represents hydrogen, an alkyl group of 1-4 carbon atoms or --C(O)CH.sub.3, and the blend average molecular weight of the overall polyether-containing substituents R in the surfactant is in the range from 1500 to 2200 and the EO/PO molar ratio ranges from 0.65 to 1.2.