Curing agents for epoxy-based polymers
AssigneeDorf Ketal Chemicals, LLC
InventorsDavid W. House, Ray V. Scott, Jr.
Life of this patent
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Abstract
A method for making flexible epoxy resins by curing an epoxide and a bis-phenol with an aliphatic secondary diamine having the structural formula (I) or (II): where R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 1 to about 20 carbon atoms, and R3 and R4 are each individually an alkyl or alkenyl group having from about 1 to about 20 carbon atoms, or hydrogen.
Claims17
An epoxy resin comprising the reaction products of
- (a) a 1,2-epoxy compound;
- (b) a polyol;
- and
- (c) a curing agent comprising at least one aliphatic secondary diamine of the structure,
- where in structure (I) R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 3 to about 20 carbon atoms, and in structure (II) R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 1 to about 20 carbon atoms and R3 and R4 are each individually an alkyl or alkenyl group having from about 1 to about 20 carbon atoms, or hydrogen.
A method for preparing a cured epoxy resin comprising reacting an epoxy resin with at least one curing agent comprising an aliphatic secondary diamine of the structure:
- where in structure (I) R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 3 to about 20 carbon atoms, and in structure (II) R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 1 to about 20 carbon atoms and R3 and R4 are each individually an alkyl or alkenyl group having from about 1 to about 20 carbon atoms, or hydrogen.
A method for preparing a cured epoxy resin comprising reacting an epoxy resin with a first curing agent at first temperature and with a second curing agent at a second temperature, said second curing agent comprising an aliphatic secondary diamine of the structure:
- where R1 and R2 are each individually an alkyl, alkenyl, aryl, or arylalkyl group having from about 1 to about 20 carbon atoms, and R3 and R4 are each individually an alkyl or alkenyl group having from about 1 to about 20 carbon atoms, or hydrogen.
Dependencies are inferred from the claim text.