Extruded thermoplastic articles with enhanced surface segregation of internal melt additive
View Patent ↗Disclosed herein are extruded articles such as, for example, fibers and films, containing thermoplastic polymeric compositions having a copolymeric major component and a melt processable additive treatment, wherein the melt processable additives have enhanced segregation to or expression at the surface of the article, thereby improving the effect of the desired characteristic of the additive treatment. Also disclosed are multicomponent extruded thermoplastic articles having two or more distinct components arranged in a specific geometric arrangement, wherein the thermoplastic polymeric composition of at least one geometric component includes a copolymeric major component and a melt processable additive treatment. Also disclosed are web materials including the extruded articles. Such extruded articles and multicomponent extruded thermoplastic articles are useful in a wide range of limited use and disposable products such as, for example, personal care products, mortuary and veterinary products, protective wear garments, and medical care garments and products.
1. A film comprising a core layer formed from a thermoplastic polymer composition, wherein the thermoplastic polymer composition comprises a polyolefin copolymer, propylene homopolymer, and fluorochemical, wherein polyolefin copolymers constitute about 50 wt. % or more of the polymer content of the composition, polypropylene homopolymers constitute from 0 wt. % to about 50 wt. % of the polymer content of the composition, and fluorochemicals constitute from 0 wt. % to about 5 wt. % of the polymer content of the composition, wherein propylene constitutes from about 90 wt. % to about 99.5 wt. % of the polyolefin copolymer.
2. The film of claim 1 , wherein the fluorochemical is co-extruded with the polyolefin copolymer, propylene homopolymer, or both.
3. The film of claim 1 , wherein the fluorochemical is a telomer-based fluoroalkyl acrylate fluoropolymer.
4. The film of claim 3 , wherein the telomer-based fluoroalkyl acrylate fluoropolymer comprises a majority of perfluorooctane groups.
5. The film of claim 1 , wherein fluorochemicals constitute from about 0.1 wt. % to about 4 wt. % of the polymer content of the composition.
6. The film of claim 1 , wherein fluorochemicals constitute from about 0.25 wt. % to about 2.5 wt. % of the polymer content of the composition.
7. The film of claim 1 , wherein the film also contains a skin layer.
8. The film of claim 1 , wherein polyolefin copolymers constitute from about 60 wt. % to about 98 wt. % of the polymer content of the composition.
9. The film of claim 1 , wherein polyolefin copolymers constitute from about 80 wt. % to about 98 wt. % of the polymer content of the composition.
10. The film of claim 1 , wherein propylene constitutes from about 95 wt. % to about 99 wt. % of the copolymer.
11. The film of claim 1 , wherein the copolymer is a copolymer of propylene and a C 2 -C 20 α-olefin.
12. The film of claim 11 , wherein the α-olefin is ethylene.
13. The film of claim 11 , wherein the α-olefin constitutes from about 1 wt. % to about 5 wt. % of the copolymer.
14. The film of claim 1 , wherein the polyolefin copolymer is a random copolymer.
15. The film of claim 1 , wherein polypropylene homopolymers constitute from 0 wt. % to about 25 wt. % of the composition.
16. The film of claim 1 , wherein the film is microporous.
17. A nonwoven laminate comprising:
a nonwoven web; and
a film attached to the nonwoven web, the film comprising a core layer formed from a thermoplastic polymer composition, wherein the thermoplastic polymer composition comprises a polyolefin copolymer, propylene homopolymer, and melt processable additive, wherein the polyolefin copolymer constitutes about 50 wt. % or more of the polymer content of the composition, the polypropylene homopolymer constitutes from 0 wt. % to about 50 wt. % of the polymer content of the composition, and the melt processable additive constitutes from 0 wt. % to about 5 wt. % of the polymer content of the film, wherein propylene constitutes from about 90% by weight to about 99.5% by weight of the polyolefin copolymer.