Paintbrush embedment compound and paintbrush construction and method embodying same
AssigneeHenkel Corporation
InventorsDwight E. Peerman, H. Gorden Kanten, Kelvin K. Bonnema
Life of this patent
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Abstract
An embedment compound for a paintbrush or the like, together with a paintbrush construction and method of manufacture embodying the improved embedment compound. The embedment compound is a polyurethane composition having a crosslink density sufficient to render such compound acceptably resistant to all paint solvents. For example, a typical embodiment composition comprises a blend of Mondur MR with a prepolymer prepared from Pluracol TP-440 and Isonate 143L, and the blend cured at 100.degree. C. overnight.
Claims22
An embedment compound for a paintbrush or the like of the type which includes a plurality of bristles, a handle portion and an intermediate portion disposed between said bristles and said handle portion, said embedment compound functioning to bond said bristles to one another and to said intermediate portion and comprising:
- a highly crosslinked polyurethane composition wherein said polyurethane composition has a calculated crosslink density of at least 15 crosslinks per 10,000 cubic centimeters of cured polyurethane composition.
A paintbrush or the like comprising:
- a generally tubular ferrule having a top end and a bottom end;
- a plurality of bristles supported within said ferrule near its bottom end with a portion of said plurality of bristles extending internally within said ferrule;
- a bristle embedment compound comprising a highly crosslinked polyurethane composition, wherein said polyurethane composition has a calculated crosslink density of at least 15 crosslinks per 10,000 cubic centimeter of cured polyurethane composition, disposed within said ferrule and penetrating a portion of said bristles to bond said bristles to one another and to said ferrule;
- and
- a handle secured to and extending outwardly from the top end of said ferrule.
A method of manufacturing a paintbrush or the like of the type having a plurality of bristles, a handle and an intermediate portion disposed between said handle and bristles comprising the steps of:
- supporting a plurality of bristles with respect to said intermediate portion;
- bonding said plurality of bristles to one another and to said intermeditae portion with an effective quantity of an embedment compound comprising a highly crosslinked polyurethane adhesive, wherein said polyurethane composition has a calculated crosslink density of at least 15 crosslinks per 10,000 cubic centimeters of cured polyurethane composition.
Dependencies are inferred from the claim text.