Process for the assembly of glass devices subjected to high temperatures, compositions therefor and novel polymers for rheological control of such compositions
First Claim
1. A process for producing a bonded assembly from two substrate components, at least one of the substrate components being transparent to UV light, the process comprising:
- applying a composition comprising;
a) a monomer component comprising at least one member selected from the group consisting of 4-allyloxystyrene, 4-methallyloxystyrene, 4-crotyloxystyrene, 4-prenyloxystyrene, 2-allyloxystyrene, 2-methallyloxystyrene, 2-crotyloxystyrene or 2-prenyloxystyrene,b) a substantially linear polymer component having a formula consisting essentially of repeat units selected from the group consisting of ##STR5## where R2, R2 and R3 are H;
orR1 is methyl and R2 and R3 are H;
orR1 and R2, are H and R3 is methyl;
orR1 is H and R2 and R3 are methyl, andc) a cationic photoinitiator,the polymer component being dissolved in the monomer component and thecomposition being storage-stable, to at least one of the substrate components;
joining the two substrate components in desired alignment to produce ajoined assembly;
irradiating the joined assembly with UV light through said at least one transparent substrate component to polymerize said monomer component, thereby producing a fixtured assembly of the two substrate components; and
subsequently,heating the fixtured assembly to a temperature and for a time sufficient to cause rearrangement of the polymerized composition to a colored B-stage crosslinked polymer.
0 Assignments
0 Petitions
Accused Products
Abstract
Cationically curable adhesives and sealants with increased viscosities and improved rheological control and good storage stability are prepared using a cationically curable monomer and a thickening polymer which is the alkylation reaction product of poly(4-hydroxystyrene) or poly(2-hydroxystyrene) with a compound RX where R is allyl, methallyl, crotyl or prenyl and X is Cl, Br or I. The cationically curable monomer suitably includes at least one alkenyloxystyrene monomer. Such thickened adhesives are useful as edge sealants for flat panel display devices. A-stage curing of the adhesive with UV irradiation allows for near ambient temperature fixturing of the device assemblies and B-stage thermal curing of the adhesive can be conducted at much lower temperatures than are needed for glass frit sealants. The B-stage cured products have thermal resistance, outgassing and substrate adhesion properties adequate for flat panel display devices.
9 Citations
9 Claims
-
1. A process for producing a bonded assembly from two substrate components, at least one of the substrate components being transparent to UV light, the process comprising:
applying a composition comprising; a) a monomer component comprising at least one member selected from the group consisting of 4-allyloxystyrene, 4-methallyloxystyrene, 4-crotyloxystyrene, 4-prenyloxystyrene, 2-allyloxystyrene, 2-methallyloxystyrene, 2-crotyloxystyrene or 2-prenyloxystyrene, b) a substantially linear polymer component having a formula consisting essentially of repeat units selected from the group consisting of ##STR5## where R2, R2 and R3 are H;
orR1 is methyl and R2 and R3 are H;
orR1 and R2, are H and R3 is methyl;
orR1 is H and R2 and R3 are methyl, and c) a cationic photoinitiator, the polymer component being dissolved in the monomer component and the composition being storage-stable, to at least one of the substrate components; joining the two substrate components in desired alignment to produce ajoined assembly; irradiating the joined assembly with UV light through said at least one transparent substrate component to polymerize said monomer component, thereby producing a fixtured assembly of the two substrate components; and
subsequently,heating the fixtured assembly to a temperature and for a time sufficient to cause rearrangement of the polymerized composition to a colored B-stage crosslinked polymer. - View Dependent Claims (2, 3)
-
4. A flat panel display device having a face plate and a base plate separated by a sealed and evacuated gap, the gap being sealed by B-stage curing of a composition comprising:
-
a) a monomer component comprising at least one member selected from the group consisting of 4-allyloxystyrene, 4-methallyloxystyrene, 4-crotyloxystyrene 4-prenyloxystyrene, 2-allyloxystyrene, 2-methallyloxystyrene, 2-crotyloxystyrene or 2-prenyloxystyrene, and b) a substantially linear polymer component having a formula consisting essentially of repeat units selected from the group consisting of ##STR6## where R1, R2 and R3 are H;
orR1 is methyl and R2 and R3 are H;
orR1 and R2, are H and R3 is methyl;
orR1 is H and R2 and R3 are methyl, the polymer component being dissolved in the monomer component and the composition being storage-stable.
-
-
5. A bonding process comprising:
-
a) applying a composition comprising a storage-stable solution of; at least one cationically polymerizable monomer and a polymeric thickener of the formula;
##STR7## where n is an integer and R1, R2 and R3 are H;
orR1 is methyl and R2 and R3 are H;
orR1 and R2, are H and R3 is methyl;
orR1 is H and R2 and R3 are methyl, the composition further comprising a thermal or photo activated cationic initiator, to a first substrate, b) contacting a second substrate to the composition on the first substrate to produce a joined assembly, and subsequently c) thermally curing the composition to a B-stage polymer. - View Dependent Claims (6, 7, 8, 9)
-
Specification