Crosslinking process
US6340719B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1999 |
| Grant date | Jan 22, 2002 |
| Priority date | — |
| Expiry date | Dec 29, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/2896
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for crosslinking a melt-processed polymer composition comprises the steps of (a) forming a polymerizable mixture comprising (i) at least one monoethylenically-unsaturated monomer or prepolymer and (ii) at least one monoethylenically-unsaturated, blocked mono- or polyisocyanate that is thermally stable at a selected melt processing temperature range and that is thermally deblockable at and above a deblocking temperature that is higher than the selected melt processing temperature range; (b) exposing the polymerizable mixture to transmissive energy to polymerize the mixture to form a polymer composition comprising polymerized units derived from the blocked mono- or polyisocyanate; (c) melt processing the polymer composition at the selected melt processing temperature range to form a melt-processed polymer composition; and (d) during melt processing or thereafter, increasing the temperature of the melt-processed polymer composition to the deblocking temperatures in the presence of at least one isocyanate-reactive crosslinking agent, to effect crosslinking of the melt-processed polymer composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.