Nonwoven articles

• US 5,883,019 A
• Filed: 05/28/1996
• Issued: 03/16/1999
• Est. Priority Date: 06/02/1993
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Troung, Jack G., Wright, Bradford B., Rock, Michael M. Jr.
• Primary Examiner(s): Copenheaver, Blaine R.
• Application Number:
  US08/653,878
• Time in Patent Office: 1,022 Days
• Field of Search: 442/164, 442/57, 442/166, 442/396
• US Class Current: 442/166
• CPC Class Codes: D04H 1/587 characterised by the bonding agents used
• CPC Class Codes: D04H 1/64 the bonding agent being applied in wet state, e.g. chemical agents in dispersions or solutions
• CPC Class Codes: Y10T 442/20 Coated or impregnated woven, knit, or nonwoven fabric which is not [a] associated with another preformed layer or fiber layer or, [b] with respect to woven and knit, characterized, respectively, by a particular or differential weave or knit, wherein the coating or impregnation is neither a foamed material nor a free metal or alloy layer
• CPC Class Codes: Y10T 442/2352 Coating or impregnation functions to soften the feel of or improve the "hand" of the fabric
• CPC Class Codes: Y10T 442/2369 Coating or impregnation improves elasticity, bendability, resiliency, flexibility, or shape retention of the fabric
• CPC Class Codes: Y10T 442/2861 Coated or impregnated synthetic organic fiber fabric
• CPC Class Codes: Y10T 442/2877 Coated or impregnated polyvinyl alcohol fiber fabric
• CPC Class Codes: Y10T 442/60 Nonwoven fabric [i.e., nonwoven strand or fiber material]
• CPC Class Codes: Y10T 442/676 Vinyl polymer or copolymer sheet or film [e.g., polyvinyl chloride, polyvinylidene chloride, polyvinyl acetate, etc.]

Abstract

Nonwoven articles having high durability and absorbent-characteristics, and their methods of manufacture, are presented. One preferred article is characterized by

(a) a nonwoven web comprised of organic fibers comprised of polymers having a plurality of pendant hydroxyl groups; and

(b) a binder comprising an at least partially crosslinked and at least partially hydrolyzed polymeric resin having a plurality of pendant resin hydroxyl groups, the resin crosslinked by a crosslinking agent, the crosslinking agent selected from the group consisting of organic titanates and amorphous metal oxides, the polymeric resin derived from monomers selected from the group consisting of monomers within the general formula ##STR1## wherein: X is selected from the group consisting of Si(OR⁴ OR⁵ OR⁶) and O(CO)R⁷ ; and

R¹ -R⁷ inclusive are independently selected from the group consisting of hydrogen and organic radicals having from 1 to about 10 carbon atoms, inclusive, and combinations thereof.

Claims

1. An absorbent nonwoven article comprising:

(a) a nonwoven web comprised of a plurality of organic fibers comprising polymers having a plurality of fiber pendant hydroxyl groups, a major portion of said polymers being at least partially hydrolyzed polymerized monomers selected from the group consisting of monomers within the general formula ##STR5## wherein;

X is O(CO)R⁷, and R¹ -R³ inclusive and R⁷ are independently selected from the group consisting of hydrogen and organic radicals having from 1 to about 10 carbon atoms, inclusive, and combinations thereof; and

(b) a binder coating at least a portion of said fibers, the binder consisting essentially of polyvinyl alcohol insolubilized with a polymeric polycarboxylic acid, said polymeric polycarboxylic acid is present in an amount of about 1 weight percent to about 5 weight percent, based on the total binder weight.

2. An absorbent article in accordance with claim 1 wherein all of said polymers are at least partially hydrolyzed polymerized monomers selected from the group consisting of monomers within the general formula ##STR6## wherein X is O(CO)R⁷, and R¹ -R³ inclusive and R⁷ are independently selected from the group consisting of hydrogen and organic radicals having from 1 to about 10 carbon atoms, inclusive, and combinations thereof.

3. An absorbent article in accordance with claim 1 wherein said polymeric polycarboxylic acid is selected from the group consisting of polyacrylic acid;

polymethacrylic acid;

copolymers of acrylic acid, methacrylic acid and maleic acid; and

vinyl methyl ether/maleic anhydride copolymer.

4. An absorbent article in accordance with claim 1 wherein said nonwoven web further comprises a minor portion of fibers selected from the group consisting of cotton, viscose rayon, cuprammonium rayon, polyesters, polypropylene, and combinations thereof.

5. The absorbent nonwoven article in accordance with claim 1 wherein the binder is present in an amunt of about 20 weight percent to about 95 weight precent, based on the weight of the non-woven article.

6. An absorbent nonwoven article comprising:

(a) a nonwoven web comprised of a plurality of organic fibers comprising polymers having a plurality of fiber pendant hydroxyl groups; and

(b) a binder coating at least a portion of the fibers, the binder comprising polyvinyl alcohol insolubilized with a polymeric polycarboxylic acid, said polymeric polycarboxylic acid is present in an amount of about 1 weight percent to about 5 weight percent, based on the total binder weight.

7. The absorbent nonwoven article as defined in claim 6 wherein a the organic fibers comprise at least partially hydrolyzed polymerized monomers selected from the group consisting of monomers within the general formula:

##STR7## wherein;

X is O(CO)R⁷, and R¹ -R³ inclusive and R⁷ are independently selected from the group consisting of hydrogen and organic radicals having from 1 to about 10 carbon atoms.

8. The absorbent nonwoven article as defined in claim 6 wherein the polyvinyl alcohol is at least partially crosslinked by a crosslinking agent.

9. An absorbent article in accordance with claim 8 wherein said crosslinking agent is selected from the group consisting of organic titanates and dialdehydes.

10. An absorbent article in accordance with claim 9 wherein said organic titanates comprise materials selected from the group consisting of titanium salts of chelating organic acids, titanium complexes with beta diketones, titanium complexes with tri(hydroxyalkyl)amines, dihydroxybis(ammonium lactato) titanium, and titanium complexes with alpha-hydroxy organic acids and alditols.

11. An absorbent article in accordance with claim 10 wherein said titanium complex with alpha-hydroxy organic acids and alditols consists of a complex of titanium, lactic acid, and D-glucitol.

12. The absorbent nonwoven article as defined in claim 8 wherein the polyvinyl alcohol is bonded to at least a portion of the fibers through bonds between the pendant hydroxyl groups on the fibers and a bonding agent.

13. An absorbent article in accordance with claim 12 wherein said bonding agent is selected from the group consisting of organic titanates and dialdehydes.

14. An absorbent article in accordance with claim 13 wherein said organic titanates comprise materials selected from the group consisting of titanium salts of chelating organic acids, titanium complexes with beta diketones, titanium complexes with tri(hydroxyalkyl)amines, dihydroxybis(ammonium lactato) titanium, and titanium complexes with alpha-hydroxy organic acids and alditols.

15. An absorbent article in accordance with claim 14 wherein said titanium complex with alpha-hydroxy organic acids and alditols consists of a complex of titanium, lactic acid, and D-glucitol.

16. The nonwoven absorbent article as defined in claim 6 wherein the polymeric polycarboxylic acid is selected from the group consisting of polyacrylic acid, polymethacrylic acid, copolymers of acrylic acid, methacrylic acid and maleic acid, and vinyl methyl ether/maleic anhydride copolymer.

17. The nonwoven absorbent article as defined in claim 6 wherein the nonwoven web comprises fibers selected from the group consisting of cotton, viscose rayon, cuprammonium rayon, polyesters, polypropylene, polyvinyl alcohol, and combinations thereof, with the proviso that a major portion of said fibers comprises polymers having a plurality of pendant hydroxyl groups.

18. The nonwoven absorbent article as defined in claim 6 wherein the organic fibers have a denier within the range from 0.5 to about 10.

19. The nonwoven absorbent article as defined in claim 6 wherein the organic fibers each have a length within the range from about 0.5 to about 10 cm.

20. The absorbent nonwoven article in accordance with claim 6 wherein the binder is present in an amount of about 20 weight percent to about 95 weight percent, based on the weight of the non-woven article.

21. An absorbent nonwoven article comprising:

(a) a nonwoven web comprised of a plurality of organic fibers comprising polymers having a plurality of pendant hydroxyl groups, wherein the fibers comprise polyvinyl alcohol fibers; and

(b) a binder coating at least a portion of the fibers, the binder consisting essentially of polyvinyl alcohol insolubilized with a polymeric polycarboxylic acid, said polymeric polycarboxylic acid is present in an amount of about 1 weight percent to about 5 weight percent, based on the total binder weight.

22. The absorbent nonwoven article of claim 21 wherein the fibers comprise a combination of rayon fibers and polyvinyl alcohol fibers.

23. An absorbent nonwoven article comprising:

(a) a nonwoven web comprised of a plurality of organic fibers comprising polymers having a plurality of pendant hydroxyl groups, wherein the fibers comprise polyvinyl alcohol fibers; and

(b) a binder coating at least a portion of the fibers, the binder comprising polyvinyl alcohol insolubilized with a polymeric polycarboxylic acid, said polymeric polycarboxylic acid is present in an amount of about 1 weight percent to about 5 weight percent, based on the total binder weight.

24. The absorbent nonwoven article of claim 23 wherein the fibers comprise a combination of rayon fibers and polyvinyl alcohol fibers.