Aqueous resin composition, and method of manufacturing a...

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...

Reexamination Certificate

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C024S445000, C024S448000, C024S450000, C427S389900, C523S406000, C523S415000, C525S111000, C525S123000, C525S453000, C525S454000, C525S455000

Reexamination Certificate

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10671455

ABSTRACT:
An aqueous resin composition satisfying the following criteria (I)–(III). (I) The aqueous resin composition contains (a) an aqueous dispersion of a polyurethane resin obtained from a macromolecular polyol, organic polyisocyanate, chain extending agent and 2,2-dimethylolbutanoic acid, and, if required, (b) an aqueous dispersion of an acrylic resin. (II) When the resin comprising this aqueous resin composition contains mainly a polyurethane resin, the inherent viscosity (ηinh) of the polyurethane resin measured at a concentration of 0.5 g/dL in dimethylformamide solution is in the range of 0.2–0.7 dL/g. After this aqueous resin composition is dried, the elastic modulus at 25° C. of the film obtained by heat treatment at 80° C. for 8 hours is in the range of 8.0×106–5.0×108Pa, and the elastic modulus at 80° C. is 8.0×107Pa or less. When this aqueous resin composition is used to treat fibrous sheets, it gives fibrous products having excellent performance and durability without any problem regarding safety, hygiene or pollution, and, when it is used as a back coating resin for a separable fastener, a separable fastener is obtained having excellent resistance to fiber dropout in washing and resistance to chlorine bleaching agents, together with good durability over very long periods of use.

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Chemical Abstracts Accession No. 1999:773811 for Zeng, et al.,. “Comparison Between Main Properties of Polyurethane Dispersion Based on DMBA and DMPA”, Pige Huagong (1999), vol. 16, No. 5, pp. 19-22.
Jun, Zeng, “Comparison Between Main Properties of Polyurethane Dispersions Based on DMBA and DMPA”, (1999) 16(5), pp. 19-22 (with English translation).

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