Browse Prior Art Database

PEELABLE OBSCURATION COATINGS FOR RESPONSIVE ANSWER SHEETS

IP.com Disclosure Number: IPCOM000022878D
Original Publication Date: 1976-Mar-31
Included in the Prior Art Database: 2004-Mar-27
Document File: 2 page(s) / 217K

Publishing Venue

Xerox Disclosure Journal

Abstract

The present invention relates to answer sheets having peelable obscuration coatings. The printing 1 to be concealed on the paper answer sheet 2 are first over- coated with a sizing or sealing formulation 3 which preferably uses methyl cellulose as a water-soluble binder and film-~former, Coating 3 seals in all pores and random free fibers of the answer sheet 2, A coating formulation 4, using ethyl cellulose as the water~insolublebinder and film-former, overlies coating 3, Coating 4 contains a sufficiently high amount of light absorbing or reflecting pigments to obscure any printing 1 underneath, Coating 3 is transparent or strongly light transmissive and will allow coating 4 to be peeled off easily.

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XEROX DISCLOSURE JOURNAL

~ Proposed Classification
FOR RESPONSIVE ANSWER SHEETS U.S. Cl. 35/9E
H.
Meyer mt. Cl~ G09b 3/00

The present invention relates to answer sheets having
peelable obscuration coatings. The printing 1 to be
concealed on the paper answer sheet 2 are first over-
coated with a sizing or sealing formulation 3 which
preferably uses methyl cellulose as a water-soluble
binder and film-~former, Coating 3 seals in all pores
and random free fibers of the answer sheet 2, A
coating formulation 4, using ethyl cellulose as the
water~insolublebinder and film-former, overlies coating
3, Coating 4 contains a sufficiently high amount of
light absorbing or reflecting pigments to obscure any
printing 1 underneath, Coating 3 is transparent or
strongly light transmissive and will allow coating 4
to be peeled off easily.

While methyl cellulose and ethyl cellulose are the preferred film~formers, other combinations of water-
soluble and water-insoluble polymers in coatings 3 and 4, respectively, could be formulated to obtain peelability.

Volume 1 Number 3 March 1976 1

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