发明名称 |
EXPANDABLE MICROSPHERES AND METHODS OF MAKING AND USING THE SAME |
摘要 |
Expandable microspheres formed by suspension polymerization using a shot growth method are provided. The microspheres are formed of a continuous, gas impermeable shell surrounding a blowing agent. The shell includes a first polymer layer formed from primary monomers and a second layer that includes a chemically reactive monomer or a high Tg monomer. To form the microspheres, the primary monomers are polymerized in a reaction vessel to an approximate 90% polymerization, at which time a secondary monomer that is either a monomer having a Tg of at least 85° C. or a chemically reactive monomer, is added to the reaction vessel to drive the polymerization reaction to completion. The outer layer thus contains either a larger amount of the high Tg monomer or a chemically reactive monomer that possesses the ability to covalently bond a cationic species. The microspheres may be used in papermaking processes to increase the paper bulk.
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申请公布号 |
US2010051220(A1) |
申请公布日期 |
2010.03.04 |
申请号 |
US20090549960 |
申请日期 |
2009.08.28 |
申请人 |
INTERNATIONAL PAPER COMPANY |
发明人 |
HONG YAOLIANG;MOHAN KOSARAJU KRISHNA;FROASS PETER M.;FAGAN MARK;ANDERSON CHRISTOPHER D.;BOYARS BRIAN;DANIELS ERIC SCOTT;DIMONIE VICTORIA LAURENTIA;SUDOL EDWARD DAVID;KLEIN ANDREW |
分类号 |
D21H23/00;C08J9/22;D21H17/00 |
主分类号 |
D21H23/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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