Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1994-07-20
1996-01-02
Yoon, Tae H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
524242, 524251, 524252, 524259, 524330, 524338, 524341, 524903, 252305, C08K 513, C08K 534
Patent
active
054809258
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to an adhesive that, when applied to a substrate, exhibits a color that confirms where it has been applied and then fades upon drying.
BACKGROUND ART
For the purpose of confirming the area coated and the weight of the adhesive applied when adhesives are sprayed, adhesives colored by pigments or dyes have been used. Such adhesives do not fade or change color after spraying and drying, and are consequently undesirable for many applications.
The present invention provides an adhesive, preferably an aerosol adhesive, that, immediately after application, exhibits a color which allows confirmation of the area coated and the weight of the adhesive applied. The color of the adhesive subsequently fades to clear upon drying.
SUMMARY OF THE INVENTION
The present invention relates to a self-fading color adhesive. The self-fading color adhesive shows a color immediately after spraying and said color fades with the passage of time. In general it can be used advantageously where it is desirable to see the portion of the substrate initially treated with adhesive, but where it would be undesirable for the final adhesive to have color. For example, in applications involving thin, clear or lightly colored substrates, it may be undesirable to have the adhesive permanently colored, since the adhesive would permanently distort the color of the substrate.
DETAILED DESCRIPTION OF THE INVENTION
The invention is preferably directed towards incorporating a color changing acid-base indicator into sprayable adhesives. More specifically, the self-fading color adhesive of the present invention comprises the following components: (a) clear or slightly colored organic solvent type adhesive, (b) basic material which readily volatilizes at ambient temperatures, (c) acid-base indictor which is colored in basic environment and turns clear in non-basic environment, and preferably (d) spraying agent.
The invention is not intended to be limited to specific adhesive composition. The non-volatile adhesive components can be selected from a wide variety of adhesive components commonly employed in adhesives including polymers of acrylic esters or partially crosslinked acrylic esters and elastomeric adhesives including partially crosslinked or soluble styrene-butadiene rubber, butyl rubber, thermoplastic block copolymers such as styrene-isoprene-styrene or styrene-butadiene-styrene block copolymers, polychloroprene rubber, natural rubber and butadiene-acrylonitrile rubber. Other classes of adhesives such as polyvinyl chloride, polyvinylacetate, polyvinylalcohol and polyvinylpyrrolidone also form suitable sprayable adhesives. The adhesive can also include tackifiers, such as polyterpene resins and hydrogenated rosin esters. A preferred acrylic ester is a crosslinked isooctyl acrylate and acrylic acid copolymer which can be made by the method described in U.S. Pat. No. 3,578,622, Example 1.
Preferred tackifiers are hydrogenated rosin esters such as Estergum H, available from Arakawa Chemical Co., Ltd., and Pentalyn H and Foral 105 both available from Hercules Co. Other suitable tackifiers are terpene phenolic resins such as SP-560 resin available from Schenectedy Chemical Co. and hydrocarbon resins such as Arkon P115 resin available from Arakawa Company (Japan). The tackifier could also be selected from phenolic resins, and plasticizers such as dioctylphthalate (DOP) and dioctylsebacate (DOS). In the present invention, the non-volatile adhesive components and tackifiers can be used alone or in combination of two or more.
The organic solvents in the present invention may be selected from a proper quantity of known solvents which readily volatilize at normal (ambient) temperature, such as n-hexane, n-heptane, methylethylketone, isohexane, methanol, ethanol and
Desirable basic materials which readily volatilize at ambient temperatures for use in the present invention, include aminoalcohols such as alkylamines such as ethylamine, diethylamine, methylamine, dimethylamine, triethylamine; ethyleneamines s
REFERENCES:
patent: 3400095 (1968-09-01), Kremer et al.
patent: 3578622 (1971-05-01), Brown et al.
patent: 3776873 (1973-12-01), Kremer
patent: 4598105 (1986-07-01), Weber et al.
patent: 4994322 (1991-02-01), Delgado et al.
Precision Valve Specification Sheet.
Masuzaki Hisao
Sugii Shinji
Griswold Gary L.
Kirn Walter N.
Minnesota Mining and Manufacturing Company
O'Shaughnessy Christine T.
Yoon Tae H.
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