Structured latex core-shell polymer particles suitable for use in the preparation of composite sheets
First Claim
1. A structured latex polymer particle suitable for use in the preparation of a wet-laid composite sheet having good wet-end and end-use properties, said polymer particle comprising:
- (a) from about 10 to about 40 percent of the total polymer particle volume of a core region having a Tg of from about 20°
to about 120°
C.; and
(b) from about 60 to about 90 percent of the total polymer particle volume of a shell region having a Tg of from about 10°
to about -90°
C. and comprising a vinyl acid.
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Abstract
A structured latex polymer particle suitable for use in the preparation of a wet-laid composite sheet having good wet-end and end-use properties. The structured latex particle has a core region comprising from about 10 to about 40 percent of the total polymer particle volume and a shell region comprising from about 60 to about 90 percent of the total polymer particle volume and comprising a vinyl acid. The core region is prepared to have good end-use properties as measured by tensile and elongation and the shell region is prepared to have good wet-end properties as measured by deposition and drainage time. The subject structured latex polymer particles are thus advantageously employed in the preparation of composite sheets of all types to thus form an economical and high quality composite sheet.
14 Citations
7 Claims
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1. A structured latex polymer particle suitable for use in the preparation of a wet-laid composite sheet having good wet-end and end-use properties, said polymer particle comprising:
-
(a) from about 10 to about 40 percent of the total polymer particle volume of a core region having a Tg of from about 20°
to about 120°
C.; and(b) from about 60 to about 90 percent of the total polymer particle volume of a shell region having a Tg of from about 10°
to about -90°
C. and comprising a vinyl acid. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification