Method for producing compositions containing interparticle crosslinked aggregates
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
C08L-033/08
C08L-031/04
C08L-033/20
C08L-033/26
C08G-063/91
출원번호
US-0228947
(1994-04-18)
발명자
/ 주소
Lahrman Frank H. (Cincinnati OH) Roe Donald C. (Cincinnati OH) Berg Charles J. (Cincinnati OH)
출원인 / 주소
The Procter & Gamble Company (Cincinnati OH 02)
인용정보
피인용 횟수 :
40인용 특허 :
0
초록▼
Methods of producing particulate, absorbent, polymeric compositions comprising interparticle crosslinked aggregates. In the methods of the present invention, an interparticle crosslinking agent is applied onto precursor particles; the precursor particles are physically associated to form a multiplic
Methods of producing particulate, absorbent, polymeric compositions comprising interparticle crosslinked aggregates. In the methods of the present invention, an interparticle crosslinking agent is applied onto precursor particles; the precursor particles are physically associated to form a multiplicity of aggregates; and the interparticle crosslinking agent is reacted with the polymer material of the precursor particles of the aggregates, while maintaining the physical association of the precursor particles, to form crosslink bonds between the precursor particles to form interparticle crosslinked aggregates. The interparticle crosslinked aggregates are formed to such an extent that the mass average particle size of the polymeric composition is at least about 25% greater than the mass average particle size of the precursor particles.
대표청구항▼
A method for producing a particulate, absorbent, polymeric composition comprising interparticle covalently crosslinked aggregates, said method comprising the steps of: (a) providing substantially dry precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material;
A method for producing a particulate, absorbent, polymeric composition comprising interparticle covalently crosslinked aggregates, said method comprising the steps of: (a) providing substantially dry precursor particles of substantially water-insoluble, absorbent, hydrogel-forming, polymer material; said polymer material of said precursor particles being a slightly network crosslinked product of a polymer selected from the group consisting of hydrolyzed starch/acrylonitrile graft copolymer, partially neutralized starch/acrylonitrile acid graft copolymer, starch-acrylic acid graft copolymer, partially neutralized starch-acrylic acid graft copolymer, saponified vinyl acetate-acrylic ester copolymers, hydrolyzed acrylonitrile or acrylamide copolymers, and partially neutralized polyacrylic acid; (b) applying (i) an interparticle crosslinking agent and (ii) 0.01 to about 60 parts by weight per 100 parts by weight of said precursor particles of water, a hydrophilic organic solvent, or a mixture thereof onto said precursor particles; provided that when water is applied to said precursor particles it is used in a proportion of from about 0.1 parts to about 10 parts by weight per 100 parts by weight of the precursor particles; said interparticle crosslinking agent being capable of reacting with said polymer material of said precursor particles; said interparticle crosslinking agent being selected from the group consisting of polyhydric alcohol compounds, polyglycidyl ether compounds, polyfunctional aziridine compounds, polyfunctional amine compounds, or polyfunctional isocyanate compounds; (c) forming a multiplicity of aggregates of said precursor particles; and (d) reacting said interparticle crosslinking agent with said polymer material of said precursor particles of said aggregates, while insuring minimal dissociation forces or stresses are introduced during the reaction step, to form covalent crosslink bonds between said precursor particles to form interparticle crosslinked aggregates, said interparticle crosslinked aggregates being present in the polymeric composition in an amount such that the polymeric composition has a mass average particle size at least about 25% greater than the mass average particle size of said precursor particles.
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