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:
Aug. 31, 1993
Filed:
Sep. 18, 1991
Tokyo Seat Co., Ltd., Saitama, JP;
Abstract
A process for producing a urethane foam having a high density outer surface layer, of the type wherein a plastic liquid containing aromatic isocyanates, polyols, a catalyst, low-molecular polyols used as a crosslinker or a chain extender, a blowing agent consisting of water, and an assistant is poured into a closed mold through a one-shot molding process, a certain type of catalyst is added to create a difference in gas evolving reaction between an inner part and an outer part of the plastic liquid within the mold so as to form a high density layer on the outer surface of a urethane form. The catalyst includes a piperazine compound, a morpholine compound, or a mixture thereof. An imidazole compound, a triazine compound, an amidine compound or an organic acid salt of the amidine compound, or a mixture resulting from any combination thereof may be used in combination with the piperazine compound or a morpholine compound.