Process for preparing low haze, high temperature-resistant laminates
AssigneeGoodyear Aerospace Corporation
InventorJohn Uram, Jr.
Life of this patent
Estimating the term…
Abstract
A process for providing a low haze, high transparent, high heat-resistant laminate by forming a preform laminate of a high heat-resistant layer covered on both surfaces by a non-glass protective layer with at least one said layer being an as-cast acrylic layer. This combination can be readily stored for long periods of time or used immediately after the formation thereof by peeling off one of the as-cast acrylic layers and applying a transparent flexible adhesive layer thereto. The transparent material can be added to the adhesive layer. Many other combinations and laminates can be formed from the preform high heat-resistant laminate since during the preparation thereof, haze is not introduced to the transparency via moisture, and contact with haze-forming release coatings is avoided.
Claims32
A process for preparing a transparent, low haze, high heat-resistant laminate, comprising the steps of:
- forming a high heat-resistant layer between transparent protective layers so that a transparent protective layer is located on either side of said heat-resistant layer, at least one of said protective layers being an as-cast acrylic layer, and curing said heat-resistant layer at a temperature of from about 60.degree. F. to about 250.degree. F.,
- wherein said high heat-resistant layer has from about 80 parts to about 100 parts by weight of an epoxy resin, said epoxy resin containing at least 25 percent by weight of novolac therein, and
- from about 5 to about 30 parts by weight of a boroxine compound having the formula ##STR8## wherein R is a group having from 1 to 18 carbon atoms, and from about 1 part to about 10 parts by weight of a phenyl substituted alkyl alcohol, said alkyl alcohol having from 1 to 10 carbon atoms.
A process for preparing a transparent, low haze, heat-resistant laminate, comprising the steps of:
- locating two protective layers in juxtaposition to one another and having a space therebetween, at least one of said protective layers being an as-cast acrylic material,
- forming a high heat-resistant material between said spaced protective layers, and curing said heat-resistant material at a temperature of from about 60.degree. F. to about 250.degree. F.,
- said high heat-resistant layer having from about 80 parts to about 100 parts by weight of an epoxy resin, said epoxy resin containing at least 25 percent by weight of novolac therein, and
- from about 5 to about 30 parts by weight of a boroxine compound having the formula ##STR19## where R is a group having from 1 to 18 carbon atoms, and from about 1 to about 40 parts by weight of a phosphate compound.
Dependencies are inferred from the claim text.