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EP0500369A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Abrasive product having a binder comprising an aminoplast binder

Assignee: 3M Co
•
Filing: 1992-02-20
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Granted: —
•
Expires: 2012-02-20
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Abstract

Abstract This invention relates to abrasive products having a resinous binder. The abrasive products can be bonded abrasives, coated abrasives, or nonwoven abrasives. In the manufacture of coated abrasives, the make coat and abrasive grains are first applied to the backing, then the size coat is applied, and finally, the construction is fully cured. Generally, thermally curable binders provide coated abrasives with excellent properties, e.g., heat resistance. In order to obtain the proper coating viscosities, solvent is commonly added to these resins. When polyester or cellulosic backings are used, curing temperature is limited to about 130°C. At this temperature, cure times are long. The long cure time along with the solvent removal necessitates the use of festoon curing areas. Disadvantages of festoon curing areas include the formation of defects at the suspension rods, inconsistent cure due to temperature variations in the large festoon ovens, sagging of the binder, wrinkling of very flexible webs, and shifting of abrasive grains. Furthermore, festoon curing areas require large amounts of space and enormous amounts of energy. Radiation curing processes have been used in an attempt to avoid the disadvantages of festoon ovens. This invention provides abrasive products comprising abrasive grains bonded together or bonded to a backing by means of a binder comprising an oligomeric aminoplast resin having on average at least one pendant Œ,[3-unsaturated carbonyl group per oligomeric unit. The oligomeric aminoplast resins polymerize via free radical polymerization at the site of the α,β-unsaturation. Polymerization is initiated by a source of free radicals. The source of free radicals can be generated by electron beam radiation or by an appropriate curing agent or initiator upon exposure to heat or radiation energy. The coated abrasive of this invention demonstrates improved grinding performance under severe conditions as compared with coated abrasives comprising radiation curable resins heretofore known.

Inventors

  • 👤 Alan R. C/O Minnesota Mining And Kirk
  • 👤 Eric G. C/O Minnesota Mining And Larson

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 22:34
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; B; B24; B24D; B24D3/00; B24D3/02; B24D3/20; B24D3/28; B24D11/00; B24D11/02; B24D3/34; B24D3/342

Claims Analysis

Total Claims: 17
Claim 1
Independent Claim 33 words
An abrasive article comprising abrasive grains, and at least one binder formed from a precursor comprising an oligomeric aminoplast resin having on overage at least one pendant a,¡3-unsaturated carbonyl group per oligomeric unit.
Claim 2
Dependent Claim 33 words
An abrasive article comprising abrasive grains, and at least one binder formed from a precursor comprising an oligomeric aminoplast resin having on overage at least one pendant a,¡3-unsaturated carbonyl group per oligomeric unit.
Claim 3
Dependent Claim 58 words
An abrasive article according to claim 1, wherein said oligomeric aminoplast resin further has at least one pendant -NHR or -OH functional group, where R represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group, provided that if the hydrocarbon group is substituted, the substituent or substituents do not inhibit or prevent polymerisation of said aminoplast resin.
Claim 4
Dependent Claim 22 words
An abrasive article according to either of claims 1 and 2, wherein said precursor further comprises at least one condensation curable resin.
Claim 5
Dependent Claim 20 words
An abrasive article according to claim 3, wherein said condensation curable resin is selected from phenolic, melamine, and urea resins.
Claim 6
Dependent Claim 23 words
An abrasive article according to any one of claims 1 to 4, wherein said precursor further comprises at least one ethylenically unsaturated compound.
Claim 7
Dependent Claim 43 words
An abrasive article according to claim 5, wherein said ethylenically unsaturated compound is selected from ethylene glycol diacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, diacrylate of bisphenol A, ethoxylated diacrylate of bisphenol A, N-vinyl-2-pyrrolidone, styrene, aliphatic urethane acrylate, divinyl benzene, and triacrylate of tris(hydroxyethyl) isocyanurate.
Claim 8
Dependent Claim 35 words
An abrasive article according to any one of claims 1 to 6, wherein said oligomeric aminoplast resin is selected from urea aldehydes, melamine aldehydes, guanamine aldehydes, aniline aldehydes, toluenesufonamide aldehydes, ethyleneurea aldehydes, and mixtures thereof.
Claim 9
Dependent Claim 18 words
An abrasive article according to any one of claims 1 to 7, further comprising a thermal curing catalyst.
Claim 10
Dependent Claim 34 words
An abrasive article according to any one of claims 1 to 8, wherein said binder further comprises a component selected from fillers, coupling agents, surfactants, wetting agents, plasticizers, fibers, dyes, pigments, and grinding aids.
Claim 11
Dependent Claim 21 words
An abrasive article according to any one of claims 1 to 9, wherein said precursor further comprises at least one photoinitiator.
Claim 12
Dependent Claim 19 words
An abrasive article according to any one of claims 1 to 10, wherein said article is a bonded abrasive.
Claim 13
Dependent Claim 35 words
An abrasive article according to any one of claims 1 to 10, wherein said abrasive article is a lofty, polymeric filamentous structure having abrasive grains distributed throughout said structure and secured therein by said binder.
Claim 14
Dependent Claim 73 words
An abrasive article according to any one of claims 1 to 10, which is a coated abrasive wherein the abrasive grains are supported on and adherently bonded to at least one major surface of a backing sheet by a make coat of a first binder material and a size coat of a second binder material, at least one of said first binder material or said second binder material being formed from said precursor.
Claim 15
Dependent Claim 43 words
An abrasive article according to any one of claims 1 to 10, a coated abrasive comprising abrasive grains which are supported on and adherently bonded to at least one major surface of a backing sheet by a binder material formed from said precursor.
Claim 16
Dependent Claim 70 words
An abrasive article according to any one of claims 1 to 10 which is a coated abrasive comprising a backing, a make coat, a layer of abrasive grains, and a size coat, wherein said backing has at least one of a saturant coat, a presize coat, or a backsize coat, wherein at least one of said saturant coat, said presize coat, or said backsize coat is formed from said precursor.
Claim 17
Dependent Claim 32 words
A coated abrasive article of any one of claims 13 to 15 wherein said abrasive grains are selected from flint, garnet, aluminum oxide, alumina zirconia, ceramic aluminum oxide, diamond, and silicon carbide.

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