Polyurethane based switchable adhesives
US11414576B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 5, 2016 |
| Grant date | Aug 16, 2022 |
| Priority date | — |
| Expiry date | Apr 9, 2038 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B2046/205
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Switchable adhesive compositions are disclosed comprising an adhesive component, which is formed from a material or materials capable of undergoing cross-linking with isocyanale other than by free radical polymerisation and at least one isocyanate having an average of more than one isocyanate functions, unsaturated curable molecules mixed in or partially bound in with the adhesive component, or unsaturated curable moieties fully bound in to the material or materials capable of undergoing cross-linking with isocyanate, and a photoinitiator. The adhesive composition forms a tacky gel-like pressure sensitive adhesive that is capable of moulding to a substrate, and upon activation of the photoinitiator the curable molecules or moieties cross-link to form a dense 3-dimensional network through the adhesive component which causes the composition to become less tacky and to form an elastic film with reduced peel strength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.