Metal bonding film compositions
Assignee3M Innovative Properties Company
InventorsC. Carol Guilbert, David V. Mahoney, Rafael Garcia-Ramirez
Life of this patent
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Abstract
An electrically insulating composition for bonding to metal and method for applying the composition in sheet form. The insulating composition comprises a polyolefin polymer adapted for elevated temperature crosslinking and a co-bonding agent mixed with the polyolefin polymer in an amount up to about 60 parts of tile co-bonding agent to 100 parts of the polyolefin polymer. Preferably, the insulating composition cures in contact with metal pre-heated to elevated temperatures in a range from about 140° C. to about 190° C. to provide a lap-shear bond strength between the electrically insulating composition and a metal substrate of from about 3.3 MPa to about 12 MPa.
Claims27
An electrically insulating composition for bonding to a metal substrate, said insulating composition comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- and
- a co-bonding agent mixed wit said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 parts of said polyolefin polymer, said insulating composition being capable of forming a bond to a heated metal substrate of from about 140° C. to about 190° C. wherein said bond between said electrically insulating composition and the metal substrate comprises a lap-shear bond strength of from about 3.3 MPa to about 12 MPa.
An electrically insulating sheet comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- and
- a co-bonding agent mixed with said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 parts of said polyolefin polymer, said insulating sheet being capable of forming a bond to a heated metal substrate of from about 140° C. to about 190° C. wherein said bond between said electrically insulating sheet and the metal substrate comprises a lap-shear bond strength of from about 3.3 MPa to about 12 MPa.
A method for insulating a metal substrate comprising the steps of:
- heating said metal substrate to an elevated temperature from about 140° C. to about 190° C. to provide a heated metal substrate;
- subsequently applying at least one sheet of an electrically insulating composition to said heated metal substrate to provide an insulation-protected metal substrate, said electrically insulating composition comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- and
- a co-bonding agent mixed with said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 parts of said polyolefin polymer;
- and
- thermally conditioning said insulation-protected metal substrate to bond said at least one sheet to said heated metal substrate to provide a lap-shear bond strength between said electrically insulating composition and said metal substrate of from about 3.3 MPa to about 12 MPa.
An electrically insulating composition for bonding to a metal substrate, said insulating composition comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- a maleated polyethylene wax in an amount from about 2.5 parts to about 10 parts of said maleated polyethylene wax to 100 parts of said polyolefin polymer;
- and
- a co-bonding a part mixed with said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 part of said polyolefin polymer, said insulating composition being capable of forming a bond to a heated metal substrate of from about 140° C. to about 190° C., wherein said bond between said electrically insulating composition and the metal substrate comprises a lap shear bond strength of from about 3.3 MPa to about 12 MPa.
An electrically insulating sheet comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- a maleated polyethylene wax in an amount from about 2.5 parts to about 10 parts of said maleated polyethylene wax to 100 parts of said polyolefin polymer;
- and a co-bonding agent mixed with said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 parts of said polyolefin polymer, said electrically insulating sheet being capable of forming a bond to a heated metal substrate of from about 140° C. to about 190° C., wherein said bond between said electrically insulating sheet and the metal substrate comprises a lap shear bond strength of from about 3.3 MPa to about 12 MPa.
A method for insulating a metal substrate comprising the steps of:
- beating said metal substrate to an elevated temperature from about 140° C. to about 190° C. to provide a heated metal substrate;
- subsequently applying at least one sheet of an electrically insulating composition to said heated metal substrate to provide an insulation-protected metal substrate, said electrically insulating composition comprising:
- a polyolefin polymer adapted for elevated temperature crosslinking;
- a maleated polyethylene wax in an amount from about 2.5 parts to about 10 parts of said maleated polyethylene wax to 100 parts of said polyolefin polymer;
- and
- a co-bonding agent mixed with said polyolefin polymer in an amount up to about 60 parts of said co-bonding agent to 100 parts of said polyolefin polymer;
- and
- thermally conditioning said insulation-protected metal substrate to bond said at least one sheet to said heated metal substrate to provide a lap-shear bond strength between said electrically insulating composition and said metal substrate of from about 3.3 MPa to about 12 MPa.
Dependencies are inferred from the claim text.