Abstract: This is a thermally conductive adhesive having excellent die shear strength, in film form, and having a weight average molecular weight of about 100,000 to 150,000, prepared from a mixture of a dietherdianhydride, a meta-substituted benzenediamine, a polysiloanediamine, and a thermally conductive filler, that is suitable as a die attach adhesive: it bonds rapidly without the need for curing or baking off-line; does not produce excess stress on the die; requires no refrigeration; provides uniform bond line thickness between the die and paddle; can be used at temperatures that do not oxidize copper lead frames or produce excessive thermal stress; can be reworked; and can exert adequate adhesion during the processes of wire bonding and molding.
Type:
Grant
Filed:
August 9, 1991
Date of Patent:
April 20, 1993
Assignee:
National Starch and Chemical Investment Holding Corporation
Abstract: This invention presents water-resistant, formaldehyde-free starch-based corugating adhesives. The adhesives are alkaline-curing and contain 0.1-7% (by wt.) of a crosslinking agent which is a condensate of an epihalohydrin and an amine, a polyamine, or ammonia.
Type:
Grant
Filed:
January 19, 1990
Date of Patent:
March 2, 1993
Assignee:
National Starch and Chemical Investment Holding Corporation
Inventors:
Michael Foran, Jules Schoenberg, Dilip Ray-Chaudhuri
Abstract: A formaldehyde-free latent crosslinking monomer represented by the formula ##STR1## in which R.sup.1 and R.sup.2 are C.sub.1 -C.sub.3 alkyl; R.sup.3 is hydrogen, C.sub.1 -C.sub.3 alkyl, or R.sup.4 --C(O)--; and R.sup.4 is C.sub.1 -C.sub.3 alkyl or C.sub.6 -C.sub.8 aryl, contains an allyl group capable of undergoing addition copolymerization and a dialkoxy ethyl group capable of crosslinking under acidic conditions. The monomer can be copolymerized with comonomers to form emulsion polymers for use as formaldehyde-free binders in nonwoven textiles. Methods for the preparation of the monomer, the polymers, and the nonwoven fabrics are described.
Type:
Grant
Filed:
August 14, 1992
Date of Patent:
February 16, 1993
Assignee:
National Starch and Chemical Investment Holding Corporation
Inventors:
John C. Leighton, Dennis Neigel, Carmine P. Iovine
Abstract: A formaldehyde-free latent crosslinking monomer represented by the formula ##STR1## in which R.sup.1 and R.sup.2 are C.sub.1 -C.sub.3 alkyl; R.sup.3 is hydrogen, C.sub.1 -C.sub.3 alkyl, or R.sup.4 --C(O)--; and R.sup.4 is C.sub.1 -C.sub.3 alkyl or C.sub.6 -C.sub.8 aryl, contains an allyl group capable of undergoing addition copolymerization and a dialkoxy ethyl group capable of crosslinking under acidic conditions. The monomer can be copolymerized with comonomers to form emulsion polymers for use as formaldehyde-free binders in nonwoven textiles. Methods for the preparation of the monomer, the polymers, and the nonwoven fabrics are described.
Type:
Grant
Filed:
September 24, 1991
Date of Patent:
January 5, 1993
Assignee:
National Starch and Chemical Investment Holding Corporation
Inventors:
John C. Leighton, Dennis Neigel, Carmine P. Iovine
Abstract: Aminophosphonate-containing polymers of the formula:--B].sub.m [A].sub.nwhereinA represents repeating units from one or more ethylenically unsaturated comonomers;B is ##STR1## wherein R is hydrogen or methyl.X is hydrogen or an alkali metal,Z is CH.sub.2 --P(O)(OX).sub.2 or C.sub.1 -C.sub.6 alkyl, aryl, cyclohexyl or alkaryl,m/n is 0.1 to .5.The novel polymers of the present invention may be used as dispersants for concentrated aqueous particulate slurries, and as corrosion inhibitors and scale inhibitors in water treatment.
Type:
Grant
Filed:
February 27, 1991
Date of Patent:
June 30, 1992
Assignee:
National Starch and Chemical Investment Holding Corporation
Abstract: A method for manufacturing binder for lead storage battery glass mats, characterized in that the ingredients (A) and (B) below are mixed and emulsion-polymerized:(A) an aqueous dispersion obtained by mixing the following raw materials: (a) a thermo-crosslinking monomer and (b) an alkyl (meth)acrylate ester, as necessary ingredients, and emulsion-polymerizing them;(B) a monomer mixture of a polymerizable unsaturated carboxylic acid (c) and the alkyl(meth)acrylate ester, as necessary ingredients.
Type:
Grant
Filed:
December 14, 1989
Date of Patent:
June 9, 1992
Assignee:
National Starch and Chemical Investment Holding Corporation
Abstract: The use of ethylene glycol diacetate in place of methyl chloroform (1,1,1-trichloroethane) in conventional waterborne packaging and converting adhesives provides comparable adhesive products with reduced environmental and health related problems.
Type:
Grant
Filed:
August 14, 1990
Date of Patent:
March 31, 1992
Assignee:
National Starch and Chemical Investment Holding Corporation
Inventors:
John W. Walker, Joseph Wieczorek, David W. Lydzinski, Malie Tsurunaga
Abstract: Rapidly immobilizing paper coating compositions may be prepared by formulating an aqueous coating composition comprising a cationic starch, pigment and sufficient base to obtain a pH above the pK of the starch derivative so that the starch is no longer cationic; coating the paper substrate; and lowering the pH of the coating such that the starch becomes cationic.
Type:
Grant
Filed:
November 6, 1989
Date of Patent:
March 3, 1992
Assignee:
National Starch and Chemical Investment Holding Corporation
Inventors:
Joseph Fernandez, Daniel Solarek, John Koval
Abstract: A solvented polyurethane adhesive composition comprising 20 to 40% by weight of diphenylmethane diisocyanate, 0.5 to 4.0% by weight of a caprolactone triol, 40 to 75% by weight of a neopentyl adipate ester diol, 0 to 10% by weight of at least one polypropylene oxide diol, and a functionally effective amount of a catalyst therefor.
Type:
Grant
Filed:
April 17, 1990
Date of Patent:
October 15, 1991
Assignee:
National Starch and Chemical Investment Holding Corporation
Abstract: A composition comprising a multifunctional glycidyl ether having at least three epoxy groups per molecule with a hardening amount of a mixture of a rigid aromatic diamine and an aromatic diaminopolysiloxane can be thermally cured to a compatible composition. Glycidylamines cannot be used in this composition. Optionally, a diglycidyl ether can be included.The cured compositions have higher glass transition temperatures than previously observed with epoxy/silicone systems. They also have improved resistance to atomic oxygen over that shown by epoxy formulations lacking a polysiloxane species therein.