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EP0486308A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Coated abrasive having an overcoating of an epoxy resin coatable from water and a grinding aid

Assignee: 3M Co
•
Filing: 1991-11-14
•
Granted: —
•
Expires: 2011-11-14
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Abstract

Abstract This invention relates to a coated abrasive product having an overcoating, in particular an overcoating formed from an epoxy resin. Coated abrasive products comprise a backing having abrasive grains bonded thereto by one or more binders. These binders typically comprise a glutinous or resinous adhesive, and may optionally contain one or more additives. Examples of resinous adhesives include epoxy resins, phenolic resins, urethane resins, acrylate resins, and aminoplast resins. The binders previously referred to are typically applied by coating from an organic solvent. In recent years, however, there has been a need to coat these resins exclusively from water on account of increasingly stringent pollution legislation. This invention provides a coated abrasive product having a coating comprising a composition formed from an epoxy resin that is capable of being coated from water, a curing agent, and a grinding aid dispersed in the epoxy resin. It is preferred that the coat containing the epoxy resin and the grinding aid be the outermost coat of the coated abrasive product, e.g., the size coat or supersize coat, in order to position the grinding aid in direct contact with the workpiece being abraded.

Inventors

  • 👤 Chong S. C/O Minnesota Mining And Lee
  • 👤 Scott J. C/O Minnesota Mining And Buchanan

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-04 11:26
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; B; B24; B24D; B24D3/00; B24D3/34; B24D3/342; B24D3/344; B24D3/02; B24D3/20; B24D3/28

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 83 words
A coated abrasive product comprising: a. a backing; b. a make coat overlying said backing; c. a plurality of abrasive grains supported on and adherently bonded to said backing by means of said make coat; and d. a size coat overlying said abrasive grains and said make coat, wherein said size coat is formed from a composition comprising an epoxy resin coatable from water, an emulsifier for said epoxy resin, a curing agent, a grinding aid dispersed in said epoxy resin, and water.
Claim 2
Dependent Claim 83 words
A coated abrasive product comprising: a. a backing; b. a make coat overlying said backing; c. a plurality of abrasive grains supported on and adherently bonded to said backing by means of said make coat; and d. a size coat overlying said abrasive grains and said make coat, wherein said size coat is formed from a composition comprising an epoxy resin coatable from water, an emulsifier for said epoxy resin, a curing agent, a grinding aid dispersed in said epoxy resin, and water.
Claim 3
Dependent Claim 26 words
A coated abrasive according to Claim 1 wherein the size coat is a supersize coat and overlies a further size coat which overlies the abrasive grains.
Claim 4
Dependent Claim 23 words
A coated abrasive product according to either of Claims 1 and 2, wherein said epoxy resin is a diglycidyl ether of bisphenol A.
Claim 5
Dependent Claim 20 words
A coated abrasive product according to any one of Claims 1 to 3, wherein said grinding aid is potassium fluoroborate.
Claim 6
Dependent Claim 25 words
A coated abrasive product according to any one of Claims 1 to 4, wherein said curing agent is selected from amines, amides, imidazoles, and urea-formaldehyde.
Claim 7
Dependent Claim 43 words
A coated abrasive product according to any one of Claims 1 to 5 wherein the ratio of said epoxy resin to said grinding aid ranges from 10 to 85 parts by weight epoxy resin to 15 to 85 parts by weight grinding aid.
Claim 8
Dependent Claim 39 words
A coated abrasive product according to Claim 6 wherein the ratio of the said epoxy resin to said grinding aid ranges from 15 to 60 parts by weight epoxy resin to 40 to 85 parts by weight grinding aid.
Claim 9
Dependent Claim 21 words
A coated abrasive product according to any one of Claims 1 to 7 wherein said composition further comprises a dispersing agent.
Claim 10
Dependent Claim 93 words
Method of preparing the coated abrasive product of Claim 1 comprising the steps of: (1) providing a backing; (2) applying a make coat over said backing; (3) applying a plurality of abrasive grains onto said make coat; (4) at least partially curing said make coat; (5) applying over said make coat and said abrasive grains a composition comprising: (a) an epoxy resin coatable from water, (b) an emulsifier for said epoxy resin, (c) a curing agent, (d) a grinding aid dispersed in said epoxy resin, and (e) water; and (6) curing said composition.
Claim 11
Dependent Claim 63 words
Method according to Claim 9 of preparing the coated abrasive product of Claim 2 comprising the additional step of: (5a) applying a further size coat over said make coat and abrasive grains; (5b) at least partially curing said make coat and said size coat; (5c) applying over said make coat, abrasive grains, and size coat the composition of step 5 of Claim 9.

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