Heat-expandable microspheres and application thereof
US10486128B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 2016 |
| Grant date | Nov 26, 2019 |
| Priority date | — |
| Expiry date | May 16, 2036 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2423/08
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Heat-expandable microspheres having an expansion temperature which can be decreased by a simple means without changing the polymerizable monomer and its ratio and/or changing the blowing agent and its ratio, and applications thereof. The heat-expandable microspheres are composed of a thermoplastic resin shell and a core material encapsulated therein. The core material contains a thermally-vaporizable blowing agent which imparts a swelling degree of less than 5% as defined by the following formula (I) and a component (A) which imparts a swelling degree of 5 to 30% as defined by the following formula (I), wherein an amount of the component (A) ranges from 0.0001 to 30 parts by weight to 100 parts by weight of the blowing agent: Swelling degree (%)={(M2−M1)/M1}×100 (I) wherein M2 and M1 are as defined herein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.