Patent · US Active

Thermally expandable thermoplastic microspheres and process for their preparation

US11939446B2 · kind B2 · utility

0Cited by

7References

21Claims

0Family size

Assignee

NOURYON CHEMICALS INTERNATIONAL B.V. · NL

Inventors

Christina Nyholm · Sundsvall, SE
Per Anders Restorp · Skara, SE
Anders Törncrona · Bohus, SE
Helena BERGENUDD · Sundsvall, SE
Andreas Ake Sundblom · Alingsås, SE
Bo Andreasson · Sundsvall, SE

Key dates

Filing date	Jul 11, 2017
Grant date	Mar 26, 2024
Priority date	—
Expiry date	Nov 20, 2038

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08J2339/06
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

The invention relates to a process for the manufacture of thermally expandable thermoplastic microspheres. The process comprises, providing a mixture of monomeric materials suitable for polymerisation to form a thermoplastic polymer and at least one blowing agent, providing to the mixture a colloidal silica that is surface-modified with at least hydrophobic organosilane groups and forming an emulsion. A polymerisation is performed to form the thermally expandable thermoplastic microspheres. The invention further relates to thermally expandable thermoplastic micro spheres, expanded micro spheres and their use in the manufacture of products.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.