Polymer, process and composition
First Claim
1. A process for preparing a substantially gel free non-dendrimer polyamide comprising primary amino groups, the process comprising the step of reacting Reagent A and Reagent B in a reaction mixture in the presence of at least 5.1% and less than 23.3% water by weight of a total amount of Reagents A and B sufficient to prevent gelation, whereinReagent A comprises at least one diaminoC1-12hydrocarbon;
- andReagent B comprises at least one di(C1-12hydrocarbo-oxy) C3-10hydrocarbo-enedioate and/or anhydride thereof, whereinReagent A and Reagent B are present in an amount to provide a molar ratio Rt of Reagent A to Reagent B which is in a range of 1.1 to 2.9.
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Accused Products
Abstract
There is described a process for producing a gel free hyperbranched polyamide polymer having primary amino groups (useful as a crosslinker). The process comprises the step of reacting at least one diamine and at least one unsaturated diester in a molar ratio of diamine to diester greater than 1 but less than 3 (preferably 2.1 to 2.9); to form the polyamide in a two stage reaction Michael addition and then amidation. The diamine in kept in excess with at least 5% of water by total weight of the diamine and diester, a reaction temperature less than the boiling point of the diamine; and is held under reduced pressure (30 mbar to 1 atms). Gelation does not occur even after substantially all ethylenic (—C═C—) double bonds; and >95% ester [—C(O)═O] groups have reacted. This violates the Flory rules which predict a gel would form based on the number of functional groups present and their degree of conversion.
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Citations
19 Claims
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1. A process for preparing a substantially gel free non-dendrimer polyamide comprising primary amino groups, the process comprising the step of reacting Reagent A and Reagent B in a reaction mixture in the presence of at least 5.1% and less than 23.3% water by weight of a total amount of Reagents A and B sufficient to prevent gelation, wherein
Reagent A comprises at least one diaminoC1-12hydrocarbon; - and
Reagent B comprises at least one di(C1-12hydrocarbo-oxy) C3-10hydrocarbo-enedioate and/or anhydride thereof, wherein Reagent A and Reagent B are present in an amount to provide a molar ratio Rt of Reagent A to Reagent B which is in a range of 1.1 to 2.9. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification