초록 ▼

This invention relates to a method of sealing the porous surfaces that can be generated during the manufacturing and processing of molded plastic parts. Liquid thermoset coatings are applied to preheated parts and cured to create a barrier on the surface to gasses generated during heat curing of sub

This invention relates to a method of sealing the porous surfaces that can be generated during the manufacturing and processing of molded plastic parts. Liquid thermoset coatings are applied to preheated parts and cured to create a barrier on the surface to gasses generated during heat curing of subsequently applied surface coatings. The liquid coating may be comprised of polyurethane forming components; those components in combination with unsaturated polyester resins; vinyl ester resin compositions; coatings derived from hydroxyl or carboxyl containing oligomers reacted with alkylated urea-formaldehyde, melamine-formaldehyde, and/or benzoquanamine-formaldehyde resins; and oligomers containing carboxyls reacted with triglycidyl isocyanurate.

대표청구항 ▼

A process for decreasing defects, caused by emanating subsurface gasses, in a subsequent coating applied over a machined surface of a molded thermoset fiber reinforced plastic part, said process comprising: heating said molded thermoset fiber reinforced plastic part to a temperature of from about 49

A process for decreasing defects, caused by emanating subsurface gasses, in a subsequent coating applied over a machined surface of a molded thermoset fiber reinforced plastic part, said process comprising: heating said molded thermoset fiber reinforced plastic part to a temperature of from about 49°C. to 204°C.; applying a coating of a liquid thermosettable composition to the machined surface of said part while said part is at a temperature from about 49°C. to 204°C.; and curing said liquid thermosettable composition to form a thermoset barrier for said gasses, wherein said liquid thermosettable composition consists essentially of a) an unsaturated polyester resin and/or a vinyl ester resin; at least one crosslinking ethylenically unsaturated monomer; and an initiator, optionally with an accelerator or mixture of accelerators; or b) a reaction product of at least one polyisocyanate with at least one member selected from the group consisting of polyols, polyamines, polymercaptans, and polycarboxylic acids; or c) the reaction product of b) and a crosslinker having functionality greater than 2 selected from species reactive with isocyanate; or d) combinations of a) and b); or e) a saturated polyester, polyether, or acrylic resin containing two or more hydroxyl and/or carboxyl groups per molecule along with an alkylated urea-formaldehyde resin, melamine-formaldehyde resin, or benzoguanamine-formaldehyde resin, and optional components selected from the group consisting of fillers, conductive pigments, antioxidants, pigments, moisture scavengers, low profile additives, and diluents.