Aqueous, coatable, thermally condensable composition

• US 5,539,042 A
• Filed: 10/13/1995
• Issued: 07/23/1996
• Est. Priority Date: 08/11/1993
• Status: Expired due to Fees

• Current Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Original Assignee: Minnesota Mining and Manufacturing Co (3M Company)
• Inventors: Birch, D'Arcie W.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US08/542,056
• Time in Patent Office: 284 Days
• Field of Search: 524/503, 525/57, 525/58
• US Class Current: 524/503
• CPC Class Codes: A47L 11/164 Parts or details of the brushing tools
• CPC Class Codes: A47L 11/4036 Parts or details of the surface treating tools
• CPC Class Codes: A47L 11/408 Means for supplying cleaning or surface treating agents
• CPC Class Codes: D04H 1/587 characterised by the bonding agents used
• CPC Class Codes: Y10T 428/2905 Plural and with bonded intersections only
• CPC Class Codes: Y10T 428/2907 with coating or impregnation
• CPC Class Codes: Y10T 442/2008 Fabric composed of a fiber or strand which is of specific structural definition
• CPC Class Codes: Y10T 442/2369 Coating or impregnation improves elasticity, bendability, resiliency, flexibility, or shape retention of the fabric
• CPC Class Codes: Y10T 442/2762 Coated or impregnated natural fiber fabric [e.g., cotton, wool, silk, linen, etc.]
• CPC Class Codes: Y10T 442/2861 Coated or impregnated synthetic organic fiber fabric
• CPC Class Codes: Y10T 442/2893 Coated or impregnated polyamide fiber fabric

Abstract

A nonwoven surface treating article suitable for treating surfaces while emitting little formaldehyde includes an open, lofty, three-dimensional nonwoven web of a plurality of thermoplastic organic fibers a bound together at places where they contact by a binder, binder comprising 1) a copolymer of an acrylate monomer and an acrylamide monomer, 2) the crosslinked reaction product of a polyol and a melamine crosslinking agent, and 3) the reaction product of a urea derivative and formaldehyde.

Claims

1. An aqueous, coatable, thermally condensable composition comprising:

(a) an aqueous dispersible copolymer of an acrylate monomer and an acrylamide monomer;

(b) an at least partially hydrolyzed polymer having a plurality of pendant hydroxy groups, the pendant hydroxy groups derived from a plurality of hydrolyzable pendant groups;

(c) a melamine crosslinking agent; and

(d) a urea derivative.

2. An aqueous, coatable thermally curable composition in accordance with claim 1 wherein said urea derivative is urea.

3. An aqueous, coatable thermally curable composition in accordance with claim 1 wherein said copolymer is derived from ethylacrylate, butyl acrylate, methylmethacrylate, and methylolacrylamide.

4. An aqueous, coatable thermally curable composition in accordance with claim 1 wherein said polyol is derived from polyvinyl acetate.

5. An aqueous, coatable thermally curable composition in accordance with claim 1 wherein said melamine crosslinking agent is selected from the group consisting of melamine and substituted versions thereof within the general formula (II):

##STR4## wherein R⁷, R⁸, R⁹, R¹⁰, R¹¹, and R¹² are independently selected from the group consisting of H and C₁ -C₁₀ (inclusive) alkyl groups bearing one or more hydroxyl groups.

6. Composition in accordance with claim 5 wherein said melamine crosslinking agent comprises the compound having R⁷, R⁸, R⁹, R¹⁰, R¹¹, and R¹² each being --CH₂ OH.

7. An aqueous, coatable thermally curable composition in accordance with claim 1 wherein said urea derivative is selected from the group consisting of:

A) compounds selected from the group consisting of compounds represented by the general formula (I) ##STR5## and mixtures thereof wherein X═

O or S and Y═

--NR³ R⁴ or --OR⁵, such that when X═

S, Y═

NR³ R⁴, each of R¹, R², R³, and R⁵ is a monovalent radical selected from the group consisting of hydrogen, alkyl groups having 1 to about 10 carbon atoms, hydroxyalkyl groups having from about 2 to 4 carbon atoms and one or more hydroxyl groups, and hydroxypolyalkyleneoxy groups having one or more hydroxyl groups, and with the provisos that;

(i) said compound contains at least one --NH and one --OH group or at least two --OH groups or at least two --NH groups;

(ii) R¹ and R² or R¹ and R³ can be linked to form a ring structure; and

(iii) R¹, R², R³, and R⁵ are never all hydrogen at the same time;

B) compounds having molecular weight less than about 300 and selected from the group consisting of alkyl substituted 2-aminoalcohols, β

-ketoalkylamides, and nitro alkanes;

C) poly(oxyalkylene)amines having molecular weight ranging from about 90 to about 1000; and

D) poly(oxyalkylene) ureido compounds having molecular weight ranging from about 90 to about 1000,

and combinations of any two or more of these.

8. An aqueous, coatable thermally curable composition in accordance with claim 7 wherein X is O, Y═

NR³ R⁴, R¹ is 2-hydroxyethyl, R² and R³ are linked to form an ethylene bridge, and is hydrogen.

9. An aqueous, coatable thermally curable composition in accordance with claim 7 wherein alkyl substituted 2-aminoalcohol is 2-amino-2-methyl-1-propanol.

10. An aqueous, coatable, thermally condensable composition comprising:

(a) an aqueous dispersible copolymer of a styrenic monomer and a diene monomer;

(b) an at least partially hydrolyzed polymer having a plurality of pendant hydroxy groups, the pendant hydroxy groups derived from a plurality of hydrolyzable pendant groups;

(c) an optional melamine crosslinking agent; and

(d) an optional urea derivative.

11. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said styrenic monomer in said aqueous dispersible copolymer is selected from the group consisting essentially of styrene, p-ethyl styrene, p-divinylbenzene, α

-bromostyrene, cinnamyl bromide and combinations thereof.

12. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said diene monomer in said aqueous dispersible copolymer is selected from the group consisting essentially of butadiene, 2-methyl-1,3-butadiene, 2,3-dimethyl-1,3-butadiene, 1,4-pentadiene and combinations thereof.

13. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said styrenic monomer in said aqueous dispersible copolymer is styrene and said diene monomer is butadiene.

14. The aqueous, coatable, thermally condensable composition as defined in claim 13 wherein said aqueous dispersible copolymer is provided as a mixture comprising between about 49 and about 52 percent by weight of said copolymer, less than about 0.1 percent by weight of residual monomers, no more than about 0.2 percent by weight ammonia and the balance water.

15. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said aqueous dispersible copolymer has a T_g less than about 100°

C.

16. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said aqueous dispersible copolymer is present within said composition at a concentration between about 30% solids and about 60% solids.

17. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said partially hydrolyzed polymer is derived from polyvinyl acetate.

18. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said partially hydrolyzed polymer is a polyester polyol, a polyether polyol or a combination thereof.

19. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said urea derivative is selected from the group consisting essentially of urea and:

A) compounds represented by the general formula (I) ##STR6## and mixtures thereof wherein X═

O or S and Y═

--NR³ R⁴ or --OR⁵, such that when X═

S, Y═

NR³ R⁴, each of R¹, R², R³, R⁴ and R⁵ is a monovalent radical selected from the group consisting of hydrogen, alkyl groups having 1 to about 10 carbon atoms, hydroxyalkyl groups having from about 2 to 4 carbon atoms and one or more hydroxyl groups, and hydroxypolyalkyleneoxy groups having one or more hydroxyl groups, and with the provisos that;

(i) said compound contains at least one --NH and one --OH group or at least two --OH groups or at least two --NH groups;

(ii) R¹ and R² or R¹ and R³ can be linked to form a ring structure; and

(iii) R¹, R², R³, R⁴ and R⁵ are never all hydrogen at the same time;

B) compounds having molecular weight less than about 300 and selected from the group consisting of alkyl substituted 2-aminoalcohols, β

-ketoalkylamides, and nitro alkanes;

C) poly(oxyalkylene)amines having molecular weight ranging from about 90 to about 1000; and

D) poly(oxyalkylene) ureido compounds having molecular weight ranging from about 90 to about 1000,

and combinations of any two or more of these.

20. The aqueous, coatable, thermally condensable composition as defined in claim 19 wherein X is O, Y is NR³ R⁴, R¹ is 2-hydroxyethyl, R² and R³ are linked to form an ethylene bridge, and R⁴ is hydrogen.

21. The aqueous, coatable, thermally condensable composition as defined in claim 19 wherein said alkyl substituted 2-aminoalcohol is 2-amino-2-methyl-1-propanol.

22. The aqueous, coatable, thermally condensable composition as defined in claim 10 wherein said melamine crosslinking agent is selected from the group consisting essentially of melamine and substituted versions thereof within the general formula (II):

##STR7## wherein R⁷, R⁸, R⁹, R¹⁰, R¹¹, and R¹² are independently selected from the group consisting of H and C₁ -C₁₀ (inclusive) alkyl groups bearing one or more hydroxyl groups.

23. The aqueous, coatable, thermally condensable composition as defined in claim 22 wherein R⁷, R⁸, R⁹, R¹⁰, R¹¹ and R¹² in said melamine crosslinking agent are each --CH₂ OH or wherein R⁷, R⁹ and R¹¹ are --CH₂ OH and R⁸, R¹⁰ and R¹² are --CH₂ --O--CH₃.