Method of increasing the size and/or absorption under load of su

Details Method of increasing the size and/or absorption under load of su Method of increasing the size and/or absorption under load of su

1994-09-28

1996-01-23

Lipman, Bernard

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

Synthetic resins

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

525119, 5253249, 5253301, 525382, 525383, 525304, C08F 832

Patent

active

054865697

ABSTRACT:
A method of enhancing the water or aqueous fluid absorption of and/or increasing the particle size of fine water-absorbent polyacrylic SAP polymer particles includes surface-contacting the SAP polymer particles with a solution containing a cross-linking agent for the polyacrylic SAP polymer, and then subjecting the particles to conditions sufficient to further cross-link the surfaces of the SAP polymer particles. The surface cross-linked particles are then impregnated with water in a weight ratio of SAP polymer, dry basis, to water in the range of about 1:1 to about 1:10 to form a paste, and the paste is subjected to conditions, such as increased temperature, e.g., 50.degree. C.-150.degree. C. to dry the polymer particles to form an acrylic SAP polymer having enhanced fluid absorption under load and, upon pulverizing, increased particle size.

REFERENCES:
patent: 4541871 (1985-09-01), Obayashi et al.
patent: 4587308 (1986-05-01), Makita et al.
patent: 4732968 (1988-03-01), Obayashi et al.
patent: 5149335 (1992-09-01), Kellenberger et al.

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