Mold component comprising a mat impregnated with a reaction product of an aminoplast resin and a polyalkylene glycol
AssigneeFiberite, Inc.
InventorWilliam A. Laurie
Life of this patent
Estimating the term…
Abstract
A shapeable matrix is provided for use in making of graphic art reproductions and in particular as a mold in forming of printing plates and other marking items.
Claims19
The method for making printing plates comprising,
- forming a carrier containing a reactive resin comprising the reaction product of an aminoplast and a resin selected from the group consisting of polyethylene glycol and polypropylene glycol under heat and pressure against a master printing plate so as to produce a cured negative of said master printing plate,
- inserting said cured negative into a molding device so as to provide a mold insert therein, and
- flowing a plastic material against said molded negative insert and curing said plastic to produce a copy of said master printing plate.
A negative printing plate against which a plastic material may be molded under heat and pressure to produce a positive printing plate comprising a reaction product of an aminoplast and a resin selected from the group consisting of polyethylene glycol and polypropylene glycol in a cured condition on a carrier therefor.
A mold component comprising,
- a relatively hard plastic sheet having a substantially homogeneous dense structure with formed areas thereon,
- said mold having been somewhat porous during its forming to permit gases to escape therethrough and having a relatively hard surface after forming such that the formed areas thereon will take minimal compressive-set upon the molding thereagainst of a plastic material under heat and pressure,
- said mold component including the reaction product of aminoplast and a resin selected from the group of polyethylene glycol and polypropylene glycol.
A printing plate matrix capable of being shaped under heat and pressure and then being used as a part of a mold for imparting a portion of its shape to a plastic material under heat and pressure comprising,
- a carrier having a porous characteristic, and
- a curable resin carried by said carrier capable of receiving very sharply defined impressions upon molding and being cured, said surface being able to be used as a mold against which another plastic material may be shaped,
- said resin including a reaction product of the components of an aminoplast resin and resin selected from the group consisting of polyethylene glycol and polypropylene glycol.
The method of making a molded carrier comprising,
- reacting the components of an aminoplast resin with a resin selected from the group consisting of polethylene glycol and polypropylene glycol to produce a reaction product,
- applying the reaction product by hot melt processing to a somewhat porous carrier and allowing the hot melt to cool, and
- pressing said carrier coated with said reaction product against a mold surface and curing under heat and pressure to produce a hard but somewhat flexible molded carrier.
Dependencies are inferred from the claim text.