Cement admixture for improved slump life

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...

Reexamination Certificate

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Details

C525S330200, C525S379000, C525S384000, C526S262000, C526S307500, C526S307600, C526S307700

Reexamination Certificate

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11329233

ABSTRACT:
Described are polymers and cement admixtures which reduce drop in fluidity with time. Said admixture comprises at least one polymer of the present invention and at least one polymer A. The polymer of the present invention comprises side chains of which at least 10 weight-% can be cleaved in alkaline medium. The polymer of the present invention is an acrylic polymer which comprises side chains connected to the backbone by ester linkages. These side chains may be alkyl, hydroxy alkyl, cycloalkyl or polyoxyalkylene groups. Polymer A is a cement dispersing agent. The combination of polymer A with the polymer of the present invention in a weight ratio of 0.1:10-10:1, and preferably 1:10-10:1 reduces the drop in fluidity with time of cementitious compositions.

REFERENCES:
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patent: 6166112 (2000-12-01), Hirata et al.
patent: 6187841 (2001-02-01), Tanaka et al.
patent: 6258162 (2001-07-01), Kawakami et al.
patent: 6294015 (2001-09-01), Yamashita et al.
patent: 6376581 (2002-04-01), Tanaka et al.
patent: 589 256 (1994-03-01), None
patent: 2 516 913 (1983-05-01), None
patent: 11-060303 (1999-03-01), None
Search Report issued in European Application No. EP 00 10 5910, Jul. 6, 2000.

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