Coating powders for protective films based on epsilon-caprolactam blocked isocyanates
AssigneeCargill, Incorporated
InventorsK. A. Pai Panandiker, Charles Danick
Life of this patent
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Abstract
This invention describes a coating composition and method for producing such composition wherein the composition includes an E-caprolactam blocked polyisocyanate including a diisocyanate selected from the group consisting of 1,4-bis (isocyanatomethyl) cyclohexane and 1,3-bis (isocyanatomethyl) cyclohexane; and a film forming hydroxy containing organic polymer.
Claims8
A coating composition which comprises a molar mixture of E-caprolactam blocked polyisocyanate and E-caprolactam blocked diisocyanate in a ratio in a range of about 1:0 to about 1:1.5,
- said blocked polyisocyanate comprising the reaction product of a polyhydric compound and a diisocyanate,
- said diisocyanate being selected from the group consisting of 1,4-bis(isocyanatomethyl)cyclohexane, 1,3-bis(isocyanatomethyl)cyclohexane and mixtures thereof,
- said polyhydric compound being selected from the group consisting of trimethylol propane, trimethylol ethane, glycerine, E-caprolactone, and mixtures thereof;
- and
- a film forming hydroxy containing polyester.
A coating composition which comprises:
- an E-caprolactam blocked polyisocyanate which is the reaction product of from about 3.0 to about 4.5 moles of a diisocyanate selected from the group consisting of 1,4-bis(isocyanatomethyl)cyclohexane, 1,3-bis(isocyanatomethyl)cyclohexane and mixtures thereof, about 1.0 mole of polyhydric compound per mole of isocyanate group, and from about 3.0 to about 6.0 moles of E-caprolactam:
- said polyhydric compound being selected from the group consisting of trimethylol propane, trimethylol ethane, glycerine, E-caprolactone, and mixtures thereof;
- of
- a film forming hydroxy containing a polyester.
A method for producing a coating composition comprising:
- reacting a reaction mixture comprising
- from about 3.0 to about 4.5 moles of a diisocyanate selected from the group consisting of 1,4-bis(isocyanatomethyl)cyclohexane, 1,3-bis(isocyanatomethyl)cyclohexane and mixtures thereof,
- about 1 mole of a polyhydric compound per mole of isocyanate group, said polyhydric compound being selected from the group consisting of trimethylol propane, trimethylol ethane, glycerine, E-caprolactone, and mixtures thereof,
- and from about 3.0 to about 6.0 moles E-caprolactam to form a block polyisocyanate component;
- mixing said blocked polyisocyanate compound with a film forming hydroxy containing polyester.
Dependencies are inferred from the claim text.