Polyurethanes containing dispersed crystalline polyesters

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...

Reexamination Certificate

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C252S182240, C252S182280, C521S170000, C521S172000, C521S173000, C521S174000, C528S074000, C528S076000, C528S080000, C528S081000, C528S085000

Reexamination Certificate

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06849666

ABSTRACT:
A process is disclosed for producing resilient polyurethane foams by foaming an organic polyisocyanate, an iso-cyanate-reactive compound and a fusible polymer. The improvement in the hardness of the foams is achieved without adversely affecting the other properties of the foams, such as tensile strength and elongation.

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Patent Abstracts of Japan, Uyama Hiroshi,Production of Terminal Reacive Polyester, Aug. 31, 2000, vol. 2000, No. 04.

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