US4587186A — Mask element for selective sandblasting and a met…

Claim 1

Independent Claim 152 words

A mask element for selective sandblasting, which comprises a support film layer and, superimposed on the support film layer in the following order, a destroyable retainer film layer of a water-insoluble cellulose derivative and sticky photoresist layer of a predetermined pattern mask constituted by solid image portions and vacant image portions and adherable, without the aid of an adhesive or the aid of the retainer film layer, to the surface of an article body to be engraved with a strength such that the mask is not detached therefrom during sandblasting, said support film layer being adapted to be stripped from the destroyable retainer film layer while maintaining adherence of the destroyable retainer film layer to the photoresist layer, said destroyable retainer film layer being not sticky and not adherable to said surface and being adapted to be destroyed by sandblasting while said solid portions of the photoresist layer are resistant to sandblasting.

Claim 2

Dependent Claim 152 words

A mask element for selective sandblasting, which comprises a support film layer and, superimposed on the support film layer in the following order, a destroyable retainer film layer of a water-insoluble cellulose derivative and sticky photoresist layer of a predetermined pattern mask constituted by solid image portions and vacant image portions and adherable, without the aid of an adhesive or the aid of the retainer film layer, to the surface of an article body to be engraved with a strength such that the mask is not detached therefrom during sandblasting, said support film layer being adapted to be stripped from the destroyable retainer film layer while maintaining adherence of the destroyable retainer film layer to the photoresist layer, said destroyable retainer film layer being not sticky and not adherable to said surface and being adapted to be destroyed by sandblasting while said solid portions of the photoresist layer are resistant to sandblasting.

Claim 3

Dependent Claim 20 words

A mask element according to claim 1, wherein said strength is 300 g/cm or more in terms of peeling resistance.

Claim 4

Dependent Claim 28 words

A mask element according to claim 1, wherein said water-insoluble cellulose derivative is at least one member selected from the group consisting of cellulose monocarboxylic esters and alkylcelluloses.

Claim 5

Dependent Claim 240 words

A mask element according to claim 1, wherein said solid image portions of the sticky photoresist layer are those which are obtained by photopolymerization of a composition comprising, as a component (a), an unsaturated polyurethane of the formula: B(XA).sub.n XB' wherein X represents a urethane residue, A represents a residue of a polyether, a polyester, a block copolymer of polyether and polyester, a mixture thereof or a polybutadiene, n represents an integer of 1 to 10, B represents a radical of the formula: ##STR4## in which Z represents a hydrogen atom or a methyl group, and Y represents --CH 2 ) m .sbsb.1 O-- in which m 1 represents an integer of 2 to 6, ##STR5## in which m 2 represents an integer of 1 to 12, or --CH 2 CH 2 O-- m .sbsb.3 in which m 3 represents an integer of 1 to 12, and B' represents a radical of the formula: ##STR6## in which Z and Y are as defined above or a radical of the formula: RO-- or ROY in which Y is as defined above and R represents an alkyl group having 1 to 8 carbon atoms, as a component (b), an ethylenically unsaturated compound, and as a component (c), a photopolymerization initiator; the weight proportions of the components (a), (b) and (c) relative to the total of the components (a) and (b) being, respectively, 50 to 98%, 2 to 50% and 0.05 to 10%.

Claim 6

Dependent Claim 48 words

A mask element according to claim 1, wherein the support film layer is a film of a synthetic resin selected from the group consisting of polypropylene, polyesters, polyvinyl chloride, polycarbonate, polystyrene and polyethylene, or a sheet of a metal selected from the group consisting of steel and aluminum.

Claim 7

Independent Claim 284 words

A method for producing a pattern-engraved article, which comprises: (1) adhering to the surface of an article body to be engraved one surface of a sticky photoresist layer of a predetermined pattern mask constituted by solid image portions and vacant image portions and adherable, without the aid of an adhesive or the aid of the retainer film layer, to said surface with a strength such that the mask is not detached therefrom during sandblasting, said sticky photoresist layer being attached, on its other surface to a support film layer through the medium of a destroyable retainer film layer of a water-insoluble cellulose derivative, said support film layer being attached to said destroyable retainer film layer with adherance smaller than the adherance of said sticky photoresist layer to said surface of the article body, said support film layer being adapted to be stripped from the destroyable retainer film layer while maintaining adherance of the destroyable retainer film layer to the photoresist layer, said destroyable retainer film layer being not sticky and not adherable to said surface and being adapted to be destroyed by sandblasting while said solid portions of the photoresist layer are resistant to sandblasting; (2) stripping the support film layer from the destroyable retainer film layer; (3) blowing an abrasive material against the destroyable retainer film layer to destroy said retainer film layer, thereby causing said vacant image portions of the sticky photoresist layer to be exposed; (4) further blowing an abrasive material through said vacant image portions against the article body to engrave an image corresponding to that of said vacant image portions on the article body; and (5) removing the solid portions of the photoresist layer to obtain a pattern-engraved article.

Claim 8

Independent Claim 284 words

A method for producing a pattern-engraved article, which comprises: (1) adhering to the surface of an article body to be engraved one surface of a sticky photoresist layer of a predetermined pattern mask constituted by solid image portions and vacant image portions and adherable, without the aid of an adhesive or the aid of the retainer film layer, to said surface with a strength such that the mask is not detached therefrom during sandblasting, said sticky photoresist layer being attached, on its other surface to a support film layer through the medium of a destroyable retainer film layer of a water-insoluble cellulose derivative, said support film layer being attached to said destroyable retainer film layer with adherance smaller than the adherance of said sticky photoresist layer to said surface of the article body, said support film layer being adapted to be stripped from the destroyable retainer film layer while maintaining adherance of the destroyable retainer film layer to the photoresist layer, said destroyable retainer film layer being not sticky and not adherable to said surface and being adapted to be destroyed by sandblasting while said solid portions of the photoresist layer are resistant to sandblasting; (2) stripping the support film layer from the destroyable retainer film layer; (3) blowing an abrasive material against the destroyable retainer film layer to destroy said retainer film layer, thereby causing said vacant image portions of the sticky photoresist layer to be exposed; (4) further blowing an abrasive material through said vacant image portions against the article body to engrave an image corresponding to that of said vacant image portions on the article body; and (5) removing the solid portions of the photoresist layer to obtain a pattern-engraved article.

Claim 9

Dependent Claim 235 words

A mask element according to claim 1, wherein said strength is 300 g/cm or more in terms of peeling resistance as measured in accordance with a peeling resistance measuring method in which: (a) the mask element is cut off, at a portion which has a length of about 30 mm and a width of about 13 mm and does not contain on the destroyable retainer film layer the vacant image portions, to prepare a specimen; (b) from the specimen, the support film layer is detached, and the specimen is, on its side of the destroyable retainer film layer, attached to the curved surface of a cylindrical column of aluminum having a height of about 13 mm and a diameter of about 30 mm through the medium of a double faced adhesive tape having a width of about 13 mm or more and a thickness of about 120 microns; (c) the surface of the specimen, attached to the cylindrical column, is pressed onto the surface of a glass plate for about 4 seconds under a pressure of about 500 g/cm 2 and, subsequently, the cylindrical column is pulled from the glass plate at a rate of about 30 mm/min to determine the maximum value of strength exerted between the surface of the specimen and that of the glass plate; and (d) the maximum value of strength is divided by 1.3 to obtain a peeling resistance value.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-05-05	1989-11-04	1990-05-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-05-05	1993-11-04	1994-05-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-05-05	1997-11-04	1998-05-06	$7700.00	Window Closed / Lapsed

Mask element for selective sandblasting and a method

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