Molded plastic product having a plastic substrate containing a filler and an in-mold plastic coating firmly bonded thereon and a process for its manufacture
AssigneeInternational Telephone and Telegraph Corporation
InventorsPeter R. Emanuel, Syed Salman, Gulam Mohiuddin
Life of this patent
Estimating the term…
Abstract
A molded part containing plastic substrate and a firmly adherent coating thereon, the plastic substrate containing a filler therein present at least in part in proximity to the surface of the substrate. The coating is transferred from the mold surface to the substrate during the molding operation and during solidification of the molded part. The molded part has a smooth surface as molded and without any subsequent finishing thereof.
Claims16
A molded part containing a plastic substrate and a firmly adherent coating thereon, the plastic substrate containing a continuous fibrous reinforcement material therein present at least in part in proximity to the surface of the substrate, said coating having been transferred from the mold surface to the substrate during the molding operation, said molded part having a smooth surface as molded and without any subsequent finishing thereof.
The molded part of claim 4 in which the glass reinforcement is in the form of a continuous glass mat.
A process of producing a molded part containing a plastic substrate and a firmly adherent coating thereon, the plastic substrate containing a continuous fibrous reinforcement material therein present at least in part in proximity to the surface of the substrate, said process comprising
- coating the surface of a mold, prior to molding said part, with a coating composition containing a reaction promoter for a reactive plastic molding material but not for said coating,
- introducing the reactive plastic molding material and the filler into the mold, said molding material and filler together comprising said plastic substrate,
- said reaction promoter in said coating being selected from the group consisting of a catalyst, a crosslinking promoter and a crosslinking initiator for said reactive plastic molding material and being present in an amount sufficient to transfer said coating composition from said mold surface to said substrate and bond it thereto,
- molding said part and
- removing said part from the mold, said molded part upon removal from the mold having a smooth surface thereon as molded and without any subsequent surface treatment thereof.
Dependencies are inferred from the claim text.