Use of an aqueous binding agent devoid of formaldehyde for...

Details Use of an aqueous binding agent devoid of formaldehyde for... Use of an aqueous binding agent devoid of formaldehyde for...

2004-09-09

2010-12-14

Jagannathan, Vasu (Department: 1796)

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...

C524S522000

Reexamination Certificate

active

07851542

ABSTRACT:
The present invention relates to formaldehyde-free aqueous binders for substrates, having a broad molecular weight distribution and comprising(A) from 0 to 100% by weight of an ethylenically unsaturated acid anhydride or ethylenically unsaturated dicarboxylic acid whose carboxylic acid groups can form an anhydride group, or mixtures thereof,(B) from 100 to 0% by weight of an ethylenically unsaturated compound,(C) at least one polyfunctional crosslinker or mixtures thereof,the polymers of A) and B) obtained by free-radical addition polymerization, when classified in a coordinate system by way of their average molecular weight Mw and their polydispersity, being situated in the area above a straight line which is defined by the linear equation y=1.25x+20 000 and has been shifted in y direction parallelwise by at least +3 000, the x axis denoting the weight-average molecular weight and the y axis the polydispersity times 10 000.

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