Claims
- 1. A screen-printable adhesive composition capable of being applied to a substrate at room temperature comprising the following components:
(a) 25 to 100 parts by weight of at least one alkyl acrylate monomer; (b) 0 to 75 parts by weight of at least one reinforcing comonomer; and (c) an effective amount of a core-shell polymer or a semi-crystalline polymer to provide a screen-printable composition; wherein said composition and components are substantially solvent free.
- 2. The screen-printable adhesive composition of claim 1 wherein said composition has a yield point of greater than 3 Pascals and a viscosity of less than 6000 centipoise at 25° C.
- 3. The screen-printable adhesive composition of claim 1 wherein said core-shell polymer is present in an amount of from 5 to 25 percent by weight of the screen-printable composition.
- 4. The screen-printable adhesive composition of claim 3 wherein the core-shell polymer is a methacrylate/butadiene/styrene core-shell polymer.
- 5. The screen-printable adhesive composition of claim 1 wherein said semi-crystalline polymer is present in an amount of from about 3 to 20 percent by weight of the screen-printable composition.
- 6. The screen-printable adhesive composition of claim 5 wherein the semi-crystalline polymer is selected from the group consisting of ethylene/ethyl acrylate/glycidyl methacrylate terpolymers, ethylene/butyl acrylate/glycidyl methacrylate terpolymers, ethylene/ethyl acrylate/carbon monoxide terpolymers, and mixtures thereof.
- 7. The screen-printable adhesive composition of claim 1 wherein said alkyl acrylate is an unsaturated monofunctional (meth)acrylic acid ester of a non-tertiary alcohol having 4 to 18 carbon atoms in the alkyl moiety.
- 8. The screen-printable adhesive composition of claim 1 wherein said reinforcing monomer has a homopolymer glass transition temperature of greater than 25° C.
- 9. The screen-printable adhesive composition of claim 1 further comprising 1 to 20 parts by volume of the adhesive composition of an electrically conductive material.
- 10. The screen-printable adhesive composition of claim 9 wherein said electrically conductive material is selected from nickel, silver, copper, or gold particles.
- 11. The screen-printable adhesive composition of claim 1 further comprising a thermally conductive material.
- 12. The screen-printable adhesive composition of claim 1 further comprising a thixotropic agent.
- 13. A screen-printable adhesive composition capable of being applied to a substrate at room temperature comprising acrylate polymer and monomers, and optional comonomer(s); said acrylate polymer and monomers, and optional comonomer(s) comprising the partial polymerization reaction product of:
(a) 25 to 100 parts by weight of at least one alkyl acrylate monomer; (b) 0 to 75 parts by weight of at least one reinforcing comonomer; and (c) an effective amount of at least one chain transfer agent; wherein said composition and components (a), (b), and (c) are substantially solvent free and said acrylate polymer has a weight average molecular weight of from 50,000 to 1,000,000.
- 14. The screen-printable adhesive composition of claim 13 wherein said chain transfer agent is present in an amount of from 0.01 to 1 pph.
- 15. The screen-printable adhesive composition of claim 14 wherein said chain transfer agent is selected from carbon tetrabromide, n-dodecyl mercaptan, or isooctyl thiolglycolate.
- 16. The screen-printable adhesive composition of claim 13 further comprising 1 to 20 parts by volume of the adhesive composition of an electrically conductive material.
- 17. The screen-printable adhesive composition of claim 16 wherein said electrically conductive material is selected from nickel, silver, copper, or gold particles.
- 18. The screen-printable adhesive composition of claim 13 further comprising a thermally conductive material.
- 19. The screen-printable adhesive composition of claim 13 further comprising a thixotropic agent.
- 20. The screen-printable adhesive composition of claim 19 wherein said composition has a yield point of greater than 3 Pascals and a viscosity of less than 6000 centipoise at 25° C.
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. Ser. No. 09/765,233, filed Jan. 18, 2001, now pending; which is a continuation of U.S. Ser. No. 09/180,800, filed Nov. 16, 1998, issued as U.S. Pat. No. 6,214,460; which is a continuation-in-part of U.S. Ser. No. 08/648,787, filed May 16, 1996, now abandoned; which is a continuation-in-part of U.S. Ser. No. 08/500,072, filed Jul. 10, 1995, now abandoned; the disclosures of all of which are herein incorporated by reference.
Divisions (1)
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Number |
Date |
Country |
Parent |
09765233 |
Jan 2001 |
US |
Child |
10602424 |
Jun 2003 |
US |
Continuations (2)
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Number |
Date |
Country |
Parent |
09180800 |
Nov 1998 |
US |
Child |
09765233 |
Jan 2001 |
US |
Parent |
08648787 |
May 1996 |
US |
Child |
09180800 |
Nov 1998 |
US |
Continuation in Parts (1)
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Number |
Date |
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Parent |
08500072 |
Jul 1995 |
US |
Child |
08648787 |
May 1996 |
US |