Nonwoven surface finishing articles reinforced with a polymer backing layer and method of making same

• US 5,858,140 A
• Filed: 06/06/1997
• Issued: 01/12/1999
• Est. Priority Date: 07/22/1994
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Berger, Jeffrey L., Fariss, Gary M.
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): YAO, SAMCHUAN CUA
• Application Number:
  US08/870,847
• Time in Patent Office: 585 Days
• Field of Search: 156/62.2, 156/244.11, 156/244.27, 156/278, 156/279, 156/309.6, 156/309.9, 51/295, 51/297, 51/298, 51/400, 451/499, 451/534, 451/539, 15/230.12, 162/358.4, 162/901
• US Class Current: 156/62.2
• CPC Class Codes: B24D 11/005 Making abrasive webs
• CPC Class Codes: B24D 3/28 Resins or natural or synthetic macromolecular compounds B24D3/22 takes precedence
• CPC Class Codes: B32B 2260/021 Fibrous or filamentary layer layers of natural mineral fibres or particles being impregnated in a plastic substance B32B19/02
• CPC Class Codes: B32B 2260/046 Synthetic resin
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 38/0004 Cutting, tearing or severing, e.g. bursting; Cutter details cutting in general B26D; laminating combined with punching or perforating B32B38/04; removing all or part of the layers B32B38/10; cutting in combination with laying up and registration B32B38/185 takes precedence
• CPC Class Codes: B32B 5/06 characterised by a fibrous or filamentary layer mechanically connected, e.g. by needling to another layer, e.g. of fibres, of paper
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12

Abstract

Abrasive and polishing belts and discs suitable for offhand and automated article finishing comprising a lofty, nonwoven abrasive web optionally needled to a woven fabric and a polymeric layer coated on the woven fabric opposite the nonwoven layer or if no woven fabric, coated on the nonwoven layer.

Claims

1. A method of manufacturing a surface treating article useful as a rotatable disc or an endless belt comprising the steps of:

(a) providing a non-woven, three-dimensional layer comprising an open, lofty web of crimped synthetic fibers adhesively bonded substantially at points of mutual contact with a binder material containing a plurality of abrasive particles, the non-woven layer having a Shore A durometer ranging from about 25 to 85;

(b) applying a hardenable, coatable composition over one major surface of the nonwoven sheet; and

(c) hardening the composition to form a continuous reinforcing polymeric layer having a thickness of about 175 to 1750 micrometers attached to and encapsulating one major surface of the nonwoven layer, the fibers from the nonwoven layer extending into and terminating in the polymeric layer to provide a surface which has substantially no fibers protruding therefrom, the polymeric providing greater resistance to heat build up than the one major surface of the nonwoven layer during abrasive and polishing applications.

2. The method of claim 1 wherein the applying is by melt extrusion of the coatable composition and hardening is by permitting the coatable composition to solidify on cooling.

3. The method of claim 1 wherein the coatable composition is a polymeric material with a melt flow temperature greater than 115°

C.

4. The method of claim 3 (wherein the coatable composition comprises a material selected from the group consisting of nylon, polyester, polypropylene, polyethylene/vinyl acetate copolymer acrylic/butadiene/styrene copolymer, polyester, polyurethane, and polyamide ether.

5. The method of claim 1 further comprising cutting and splicing the article into a continuous belt.

6. A method of manufacturing a surface treating article useful as a rotatable disc or an endless belt, comprising the steps of

(a) providing a nonwoven, three-dimensional abrasive layer comprising an open, lofty web of crimped synthetic fibers;

(b) positioning a woven fabric such that there is mutual contact between a first face of said fabric and said nonwoven material;

(c) needling the nonwoven material through the fabric;

(d) adhesively bonding the synthetic fibers at points of mutual contact with a binder material containing a plurality of abrasive particles the non-woven layer having a Shore A durometer ranging from about 25 to 85;

(e)applying a hardenable, coatable composition over a second face of the woven fabric; and

(f) hardening the composition to form a continuous reinforcing polymeric layer having a thickness of about 175 to 1750 micrometers attached to and encapsulating one major surface of the nonwoven layer, the fibers from the nonwoven extending through the woven fabric and terminating in the polymeric layer to provide a surface which has substantially no fibers protruding therefrom the polymeric layer providing greater resistance to heat build up than the second face of the woven fabric during abrasive and polishing applications.

7. The method of claim 6 wherein the applying is by melt extrusion of the coatable composition and hardening is by permitting the coatable composition to solidify on cooling.

8. The method of claim 6 wherein the coatable composition is a polymeric material with a melt flow temperature greater than 115°

C.

9. The method of claim 6 wherein the coatable composition comprises a material selected from the group consisting of nylon, polyester, polypropylene, polyethylene/vinyl acetate copolymer, acrylic/butadiene/styrene copolymer, polyester, polyurethane, and polyamide ether.

10. The method of claim 6 further comprising cutting and splicing the article into a continuous belt.