(19) |
 |
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(11) |
EP 0 071 723 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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05.09.1984 Bulletin 1984/36 |
(43) |
Date of publication A2: |
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16.02.1983 Bulletin 1983/07 |
(22) |
Date of filing: 18.06.1982 |
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(84) |
Designated Contracting States: |
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AT CH DE FR GB IT LI SE |
(30) |
Priority: |
10.08.1981 US 291205
|
(71) |
Applicant: NORTON COMPANY |
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() |
|
(72) |
Inventor: |
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- Ibrahim, Mohamed Mostafa
()
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(57) A coated abrasive of improved resistance to «ioading» comprising a flexible backing,
a plurality of abrasive grit particles dispersed over the area of at least one surface
of said backing, and at least one layer of adhesive bond ma- teriai adhering said
abrasive grit particles to each other and to said backing, characterized by the fact
that the outermost layer of said adhesive bond material comprises:
(a) animal giue, or a cured amino resin, or a mixture thereof in an amount of at least
40% by weight of the total adhesive bond material, exclusive of any filler; and
(b) at least 0.74 grams per square meter of an additive which is
(1) a mono-, di-, and tri-organyl ester of orthophosphoric acid,
(2) a salt of a mono-, di-, and tri-organyl ester of orthophosphoric acid with an
amine,
(3) a tetraorganyiammonium sait, or
(4) a soluble mixture thereof. Best results are obtained with a sizer adhesive of
amino resin containing phosphate esters or their amine salts as additive.