Thermosetting coating compositions for the sealing of fiber reinforced plastics
First Claim
1. A thermosetting organic solvent solution coating composition containing a mixture of resins comprising (1) from 30% to 70% of one or more hydroxy functional resins having a number average molecular weight of at least about 700, a Gardner bubble viscosity less than about Z4 measured in methyl ethyl ketone at 90% solids at 25°
- C., and at least 5% of the hydroxy groups thereof being primary hydroxy groups, (2) from 10% to 70% of low molecular weight epoxy ester made by esterifying one or more resinous polyepoxides having a 1,2-epoxy equivalency of at least 1.2 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25°
C., and (3) the balance of the mixture, but not less than 15% thereof, being a curing agent having a plurality of groups reactive with the hydroxy groups in the hydroxy resin and in the epoxy ester, said composition having a total solids content of at least 35%.
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Abstract
High solids thermosetting organic solvent solution coating compositions are disclosed which are particularly useful for sealing the pores in fiber reinforced plastics. These compositions contain a mixture of resins comprising (1) from 30% to 70% of one or more hydroxy functional resins having a number average molecular weight of at least about 700, a Gardner bubble viscosity less than about Z4 measured in methyl ethyl ketone at 90% solids at 25° C., and at least 5% of the hydroxy groups thereof being primary hydroxy groups, (2) from 10% to 70% of low molecular weight epoxy ester made by esterifying one or more resinous polyepoxides having a 1,2-epoxy equivalency of at least 1.2 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25° C., and (3) the balance of the mixture, but not less than 15% thereof, being a curing agent having a plurality of groups reactive with the hydroxy groups in the hydroxy resin and in the epoxy ester.
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Citations
17 Claims
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1. A thermosetting organic solvent solution coating composition containing a mixture of resins comprising (1) from 30% to 70% of one or more hydroxy functional resins having a number average molecular weight of at least about 700, a Gardner bubble viscosity less than about Z4 measured in methyl ethyl ketone at 90% solids at 25°
- C., and at least 5% of the hydroxy groups thereof being primary hydroxy groups, (2) from 10% to 70% of low molecular weight epoxy ester made by esterifying one or more resinous polyepoxides having a 1,2-epoxy equivalency of at least 1.2 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25°
C., and (3) the balance of the mixture, but not less than 15% thereof, being a curing agent having a plurality of groups reactive with the hydroxy groups in the hydroxy resin and in the epoxy ester, said composition having a total solids content of at least 35%. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
- C., and at least 5% of the hydroxy groups thereof being primary hydroxy groups, (2) from 10% to 70% of low molecular weight epoxy ester made by esterifying one or more resinous polyepoxides having a 1,2-epoxy equivalency of at least 1.2 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25°
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17. A thermosetting organic solvent solution coating composition containing a mixture of resins comprising (1) from 30% to 65% of hydroxy functional polyester resin having a number average molecular weight of at least about 700, a Gardner bubble viscosity less than about Z4 measured in methyl ethyl ketone at 90% solids at 25°
- C., and at least 50% of the hydroxy groups being primary hydroxy groups, said polyester resin having an hydroxy value in the range of 150-450 and an acid value of less than 20, (2) from 15% to 30% of an epoxy ester made by esterifying one or more resinous polyepoxides having a molecular weight below about 1000 and having a 1,2-epoxy equivalency of 1.7-2.0 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25°
C., and (3) from 15% to 35% of an alkylated aminoplast resin, said composition having a total solids content of from 50% up to about 90%.
- C., and at least 50% of the hydroxy groups being primary hydroxy groups, said polyester resin having an hydroxy value in the range of 150-450 and an acid value of less than 20, (2) from 15% to 30% of an epoxy ester made by esterifying one or more resinous polyepoxides having a molecular weight below about 1000 and having a 1,2-epoxy equivalency of 1.7-2.0 with an approximately stoichiometric proportion of monocarboxylic fatty acid to provide an essentially epoxy-free ester having a Gardner bubble viscosity less than Z4 at 75% solids in xylol at 25°
Specification