Crosslinked (meth)acrylamide particles, process for their...

Details Crosslinked (meth)acrylamide particles, process for their... Crosslinked (meth)acrylamide particles, process for their...

2005-10-12

2010-02-09

Rábago, Robert (Department: 1796)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

C525S374000, C525S379000, C422S070000, C210S656000

Reexamination Certificate

active

07659348

ABSTRACT:
Crosslinked (meth)acrylamide particles in the form of substantially spherical fine particles having particle sizes of from 1 to 1000 μm made of a polymer of a N-alkoxymethyl(meth)acrylamide and a polyfunctional unsaturated monomer copolymerizable with the N-alkoxymethyl(meth)acrylamide, wherein the structural units derived from the N-alkoxymethyl(meth)acrylamide are crosslinked by a crosslink having a structure represented by the formula 1 (wherein X is hydrogen or a methyl group, and each of R8and R9is another structural unit derived from the N-alkoxymethyl(meth)acrylamide and bonded to the nitrogen atom in another structural unit derived from the N-alkoxymethyl(meth)acrylamide monomer via a methylene group).

REFERENCES:
patent: 2978432 (1961-04-01), Graulich et al.
patent: 4198495 (1980-04-01), Sekmakas et al.
patent: 5219969 (1993-06-01), Uhl et al.

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