Process for making multilayered, formable laminates
US4892700A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 7, 1987 |
| Grant date | Jan 9, 1990 |
| Priority date | — |
| Expiry date | Oct 7, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/769
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for making a multilayered formable plastic composite laminate and a process for its manufacture which includes preparing an acrylic composition which includes the reaction product of a mixture of predominantly an acrylic monomer and a substantially lesser amount of a polymer thereof, at least one free radical reaction initiating reaction catalyst, and optionally, a chain length regulating agent or a cross-linking agent; deaerating the acrylic composition; casting the deaerated acrylic composition upon a sheet or laminate of a thermoplastic material; and curing the cast acrylic composition in several successive stages so as to substantially polymerize the acrylic monomer and to permit penetration of the acrylic composition preferably to a depth of between about 0.001-0.1 inch into thermoplastic material to form a laminate having a uniform and gradual acrylic/thermoplastic interphase, rather than a sharp separation between the layers thereof, so as to prevent delamination during further processing operations. These laminates are then thermoformed into various shaped articles.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.