Process for producing modified polyaminoamide, modified polyaminoamide produced thereby, and epoxy resin curing agent comprising the said modified polyaminoamide
AssigneeNippon Shokubai Co., Ltd.
InventorsKazumasa Kimura, Takashi Kai, Hitoshi Yano, Ryuichi Ishikawa, Kazuaki Abe, Yoshihiro Arita
Life of this patent
Estimating the term…
Abstract
A process for producing a modified polyaminoamide with markedly increased reactivity as an epoxy resin curing agent is disclosed. The process comprises introducing amino groups and mercapto groups into a polyaminoamide by using an aziridine compound and a thiirane compound. The modified polyaminoamide is capable of curing an epoxy resin at a low temperature and at a high rate to provide a cured epoxy resin excellent in anticorrosion and chemical resistance.
Claims21
A process for producing a modified polyaminoamide, comprising the step of:
- reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule, an aziridine compound represented formula (I):
- ##STR6## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4 which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and
- a thiirane compound represented by formula (II):
- ##STR7## wherein R.sup.5, R.sup.6, R.sup.7, and R.sup.8 which may be the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
A process for producing a modified polyaminoamide, comprising the step of:
- reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule, with a 1-(2-mercaptoethyl)aziridine compound represented by formula (III):
- ##STR8## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms;
- and R.sup.5, R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
A modified polyaminoamide obtained by a process comprising the step of:
- reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule, an aziridine compound represented by formula (I):
- ##STR9## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and
- a thiirane compound represented by formula (II):
- R1 ? ? ##STR10## wherein R.sup.5, R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
A modified polyaminoamide obtained by a process comprising the step of:
- reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule, with a 1-(2-mercaptoethyl)aziridine compound represented by formula (III):
- ##STR11## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms;
- and R.sup.5, R.sup.6, R.sup.7, and R.sup.8, which may by the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
An epoxy resin composition containing a curing agent, comprising
- an epoxy resin;
- and
- 0.1-2000 parts by weight per 100 parts by weight of said epoxy resin of a modified polyaminoamide obtained by a process comprising reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule, an aziridine compound represented by formula (I):
- ##STR12## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms, and
- a thiirane compound represented by formula (II):
- ##STR13## wherein R.sup.5, R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
An epoxy resin composition containing a curing agent, comprising
- an epoxy resin;
- and
- 0.1-2000 parts by weight per 100 parts by weight of said epoxy resin of a modified polyaminoamide obtained by a process comprising reacting a polyaminoamide having at least one amide group and a plurality of amino groups per molecule with a 1-(2-mercaptoethyl)aziridine compound represented by formula (III):
- ##STR14## wherein R.sup.1, R.sup.2, R.sup.3, and R.sup.4, which may be the same or different, each represent a hydrogen atom or an alkyl group having from 1 to 4 carbon atoms;
- and R.sup.5, R.sup.6, R.sup.7, and R.sup.8, which may be the same or different, each represent a hydrogen atom, an alkyl group having from 1 to 4 carbon atoms or an aryl group.
Dependencies are inferred from the claim text.