Expanded hollow micro sphere composite beads and method for their production
First Claim
1. A process for producing expanded hollow micro sphere composite beads which comprise admixing an expanded hollow thermoplastic polymer micro spheres with colloidal calcium carbonate to provide composite beads having a hollow expanded thermoplastic polymer micro sphere shell and, as deposited on its surface, colloidal calcium carbonate.
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Abstract
The invention provides expanded hollow micro sphere composite beads and a process for producing the beads. According to the invention, finely divided calcium carbonate can be uniformly deposited on expanded hollow thermoplastic polymer micro spheres by a simple procedure without incurring breakage of the expanded micro spheres so that the scattering of beads can be effectively inhibited. The preferred production process comprises admixing expanded hollow thermoplastic polymer micro spheres (A), with colloidal calcium carbonate (B) which has been surface-activated with a surface-treating agent or dispersing agent, e.g. a fatty acid series or polymer acid series compound. The admixing can be typically effected by dry-blending, preferably at a temperature of about 50-100° C.
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Citations
13 Claims
- 1. A process for producing expanded hollow micro sphere composite beads which comprise admixing an expanded hollow thermoplastic polymer micro spheres with colloidal calcium carbonate to provide composite beads having a hollow expanded thermoplastic polymer micro sphere shell and, as deposited on its surface, colloidal calcium carbonate.
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6. A process for producing expanded hollow micro sphere composite beads which comprises admixing an expanded hollow thermoplastic polymer micro spheres with finely divided calcium carbonate particles to provide composite beads having a hollow expanded thermoplastic polymer micro sphere shell and, as deposited on its surface, said finely divided calcium carbonate particles.
- 7. Expanded hollow micro sphere composite beads, said beads comprising a hollow expanded thermoplastic polymer micro sphere shell and, as deposited on its surface, a colloidal calcium carbonate and a surface treating agent selected from the group consisting of at least one of a fatty acid series compound, a polymer acid series compound, a sulfonic acid series compound, and an unsaturated carboxylic acid-containing polymer compound.
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12. A process for producing expanded hollow micro sphere composite beads which comprises admixing expanded hollow thermoplastic polymer micro spheres with colloidal calcium carbonate to provide composite beads each having a hollow expanded thermoplastic polymer micro sphere shell, and deposited on its surface, colloidal calcium carbonate, wherein the colloidal calcium carbonate contains calcium carbonate particles surface from the group consisting of at least one of a fatty acid series compound, and an unsaturated carboxylic acid-containing polymer compound.
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13. A process for producing expanded hollow micro sphere composite beads which comprises admixing expanded hollow thermoplastic polymer micro spheres with finely divided calcium carbonate particles to provide composite beads each having a hollow expanded thermoplastic polymer micro sphere shell, and deposited on its surface, colloidal calcium carbonate wherein the finely divided calcium carbonate particles surface activated in advance with a surface treating agent selected from the group consisting of a fatty acid series compound, a polymer acid series compound, a sulfonic acid series compound, or unsaturated carboxylic acid-containing polymer compound and combinations thereof.
Specification