One-liquid cold setting adhesive with encapsulated catalyst initiator
US4080238A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 1976 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Jul 14, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/249997
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A one-liquid cold setting adhesive comprising a thermoplastic, non-reactive polyurethane polymer dissolved in an addition-polymerizable combination of an acrylic or methacrylic monomer other than the acids, a copolymerizable monomer containing at least one free carboxylic group, a non-activated free radical addition polymerization catalyst system and an activator for the free radical catalyst system encapsulated in pressure-rupturable microspheres or beads having a composition which is substantially insoluble in the presence of the other components of the mixture for a relatively long time period. Exemplary of this adhesive formulation is a polyester polyurethane containing no free isocyanate groups dissolved in a mixture of methacrylic acid and methyl methacrylate, each of the three components being present in equal amounts. Included in the mix is benzoyl peroxide and hydroquinone. To this mix are added formaldehyde crosslinked gelatin microspheres having encapsulated therein an amine activator for the benzoyl peroxide. The resulant mixture has a long storage life; but when the microspheres are ruptured, the peroxide becomes activated and the adhesive bond-forming reaction takes p…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.