Polymer particles
First Claim
1. Expandable polymer particles containing a polymer of a vinylarene monomer, a porous silicate compound, and water, wherein the porous silicate compound is selected from the group consisting of alumino silicates and amorphous silica particles and the porous silicate compound is incorporated in said polymer in an amount ranging from about 0.1 to about 10% by weight based on the weight of vinylarene, water and porous silicate compound so as to retain said water in said particles in an amount ranging from 1.5% to about 20% by weight based on the weight of vinylarene, water and porous silicate for use of said water as essentially the sole blowing agent in said expandable particles for the production of pre-expanded polymer particles from said expandable particles.
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Accused Products
Abstract
Polymer particles containing a polymer of a vinylarene monomer, a porous silicate compound and at least 1.5% by weight of water, based on the weight of vinylarene, water and porous silicate compound, wherein the porous silicate compound is selected from alumino silicates and amorphous silica particles, and a process for the preparation of such polymer particles.
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Citations
11 Claims
- 1. Expandable polymer particles containing a polymer of a vinylarene monomer, a porous silicate compound, and water, wherein the porous silicate compound is selected from the group consisting of alumino silicates and amorphous silica particles and the porous silicate compound is incorporated in said polymer in an amount ranging from about 0.1 to about 10% by weight based on the weight of vinylarene, water and porous silicate compound so as to retain said water in said particles in an amount ranging from 1.5% to about 20% by weight based on the weight of vinylarene, water and porous silicate for use of said water as essentially the sole blowing agent in said expandable particles for the production of pre-expanded polymer particles from said expandable particles.
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6. Process for the preparation of pre-expanded polymer particles from expandable polymer particles containing a polymer of a vinylarene monomer and water as a blowing agent, which process includes:
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(a) preparing a viscous mass containing 10-70% by weight, based on the total amount of vinylarene present, of a polymer of a vinylarene monomer, 90-30% by weight, based on the total amount of vinylarene present, of a vinylarene monomer, and including the incorporation of a porous silicate compound in said viscous mass in an amount ranging from about 0.1 to about 10% by weight based on the weight of vinylarene, water, and porous silicate compound;
(b) suspending the viscous mass thus obtained into an aqueous medium to yield suspended particles;
(c) polymerizing the suspended particles to complete monomer conversion to produce said expandable particles containing said vinylarene, said porous silicate compound incorporated therein, and from 1.5% to about 20% by weight of water, based on the weight of vinylarene, porous silicate compound, and water; and
(d) subjecting said expandable particles to a pre-expansion process for said preparation of said pre-expanded polymer particles. - View Dependent Claims (7, 8)
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Specification