Undrawn, tough, durably melt-bondable, macodenier, thermoplastic, multicomponent filaments
AssigneeMinnesota Mining and Manufacturing Company
InventorsPhilip G. Martin, Gary L. Olson, Dennis G. Welygan
Life of this patent
Estimating the term…
Abstract
Undrawn, tough, durably melt-bondable, macrodenier, thermoplastic, multicomponent filaments, such as sheath-core and side-by-side filaments, comprising a first plastic component and a second lower-melting component defining all or at least part of the material-air boundary of the filaments. The filaments can be made by melt-extruding thermoplastics to form hot filaments, cooling and solidifying the hot filaments, and recovering the solidified filaments without any substantial tension being placed thereon. Aggregations of the filaments can be made in the form of floor matting and abrasive articles.
Claims18
Undrawn, tough, durably melt-bondable, thermoplastic, sheath-core bicomponent filaments having a linear density of 500 to 20,000 denier per filament, and comprising the following components:
- (a) a central core comprising a blend of polypropylene and ethylene- propylene-butene copolymer;
- and
- (b) a sheath comprising ethylene-vinyl acetate copolymer blended with ethylene-methyl acrylate copolymer.
Matting comprising an open, nonwoven web of a plurality of undrawn, tough, durably melt-bonded, thermoplastic, sheath-core bicomponent filaments having a linear density of 500 to 20,000 denier per filament, and comprising the following components:
- (a) a central core comprising a blend of polypropylene and ethylene- propylene-butene copolymer;
- and
- (b) a sheath comprising ethylene-vinyl acetate copolymer blended with ethylene-methyl acrylate copolymer.
Undrawn, tough, durably melt-bondable, thermoplastic, macrodenier, multicomponent filament comprising the following components:
- (a) first plastic comprising polypropylene blended with ethylene-propylene-butene copolymer;
- and
- (b) second plastic comprising synthetic thermoplastic polymer having a melting point of at least 15.degree. C. below that of said component (a);
- said components (a) and (b) being, along the length of the filament, elongated, contiguous, and coextensive in length, said component (b) defining all or at least part of the material air boundary of said filament.
Dependencies are inferred from the claim text.