US4136699A — Absorbent article with adhesive strip

Claim 1

Independent Claim 254 words

In an article for absorbing fluids, the structure comprising: (a) an elongated absorbent pad having essentially two major surfaces; (b) an outer layer in adherent contact with at least one of said two major surfaces; (c) a hot-melt pressure sensitive adhesive layer adhered to the outwardly facing surface of said outer layer, said hot-melt pressure-sensitive adhesive having a viscosity of 500 to 15,000 centipoise at its pour temperature, said pour temperature ranging from about 300° to about 400° F., said hot-melt pressure-sensitive adhesive comprising: (i) 10-20% by weight of a rubbery copolymer selected from the group consisting of a radial block-copolymer, an A-B-A block copolymer, and mixtures thereof, said radial block copolymer being a teleblock copolymer comprising molecules having at least three polymerized butadiene branches radially branching out from a central hub, each said branch having polystyrene terminal blocks; said A-B-A block copolymer having polystyrene end blocks and a rubbery, essentially saturated, poly(mono-olefin)-like midblock, (ii) more than 120 but less than 500 parts by weight, per 100 parts by weight of said rubbery copolymer of an essentially hydrocarbon oil selected from the group consisting of naphthenic oils, paraffinic oils, and mixtures thereof; the amount of said oil in said hot-melt pressure-sensitive adhesive composition being within the range of 15 to 40% by weight; (iii) more than 250 but less than 500 parts per 100 parts by weight of said rubbery copolymer, of terpene tackifier resin; the amount of terpene tackifier resin in said composition being within the range of 40 to 60% by weight.

Claim 2

Dependent Claim 254 words

In an article for absorbing fluids, the structure comprising: (a) an elongated absorbent pad having essentially two major surfaces; (b) an outer layer in adherent contact with at least one of said two major surfaces; (c) a hot-melt pressure sensitive adhesive layer adhered to the outwardly facing surface of said outer layer, said hot-melt pressure-sensitive adhesive having a viscosity of 500 to 15,000 centipoise at its pour temperature, said pour temperature ranging from about 300° to about 400° F., said hot-melt pressure-sensitive adhesive comprising: (i) 10-20% by weight of a rubbery copolymer selected from the group consisting of a radial block-copolymer, an A-B-A block copolymer, and mixtures thereof, said radial block copolymer being a teleblock copolymer comprising molecules having at least three polymerized butadiene branches radially branching out from a central hub, each said branch having polystyrene terminal blocks; said A-B-A block copolymer having polystyrene end blocks and a rubbery, essentially saturated, poly(mono-olefin)-like midblock, (ii) more than 120 but less than 500 parts by weight, per 100 parts by weight of said rubbery copolymer of an essentially hydrocarbon oil selected from the group consisting of naphthenic oils, paraffinic oils, and mixtures thereof; the amount of said oil in said hot-melt pressure-sensitive adhesive composition being within the range of 15 to 40% by weight; (iii) more than 250 but less than 500 parts per 100 parts by weight of said rubbery copolymer, of terpene tackifier resin; the amount of terpene tackifier resin in said composition being within the range of 40 to 60% by weight.

Claim 3

Dependent Claim 27 words

An article according to claim 1 wherein said structure of said article further comprises a sheet-like, removeable protective release liner means covering said hot-melt pressure-sensitive adhesive layer.

Claim 4

Dependent Claim 33 words

An article according to claim 1 wherein said structure is a sanitary napkin, and wherein said outer layer means is a fluid-pervious non-woven wrapper comprising a substantially rectangular sheet enveloping said absorbent pad.

Claim 5

Dependent Claim 59 words

An article according to claim 3 wherein said hot-melt pressure-sensitive adhesive layer comprises an elongated strip of said adhesive, narrower in width than the width of said absorbent pad, which has at least partially impregnated said nonwoven wrapper along a seam of said wrapper, thereby holding said wrapper in adherent contact with said major surface of said absorbent pad.

Claim 6

Dependent Claim 244 words

A hot-melt pressure-sensitive adhesive composition having a Brookfield viscosity ranging from about 500 to 15,000 centipoise at the pour temperature, said pour temperature ranging from about 300° to about 400° F., said composition being substantially free of solvents with a boiling point below 200° C. at atmospheric pressure and consisting essentially of: (a) 10-20% by weight of a rubbery A-B-A block copolymer having polystyrene end blocks and a rubbery, essentially saturated, poly(mono-olefin)-like midblock, said A-B-A block copolymer being at least partially incompatible with terpene tackifying resins, said A-B-A block copolymer having a modulus at 300% extension of at least about 500 p.s.i. and an ultimate tensile strength in excess of about 2,000 p.s.i.; (b) from about 300 to about 400 parts by weight, per 100 parts by weight of said A-B-A block copolymer, of terpene tackifier resin; the amount of said terpene tackifier resin in said composition ranging from 40 to 60% by weight; (c) from about 150 to about 350 parts by weight of an essentially hydrocarbon oil selected from the group consisting of naphthenic oils, paraffinic oils, and mixtures thereof; the amount of said essentially hydrocarbon oil in said composition ranging from 15 to 40% by weight; said pressure-sensitive adhesive composition having a measurable 500% modulus at 23° C., being resistant to cohesive failure in P.S.T.C.-1 180° peel strength tests throughout the aforementioned range of essentially hydrocarbon oil content, and exhibiting P.S.T.C.-1 values in excess of about 4 pounds per inch width.

Claim 7

Dependent Claim 244 words

A hot-melt pressure-sensitive adhesive composition having a Brookfield viscosity ranging from about 500 to 15,000 centipoise at the pour temperature, said pour temperature ranging from about 300° to about 400° F., said composition being substantially free of solvents with a boiling point below 200° C. at atmospheric pressure and consisting essentially of: (a) 10-20% by weight of a rubbery A-B-A block copolymer having polystyrene end blocks and a rubbery, essentially saturated, poly(mono-olefin)-like midblock, said A-B-A block copolymer being at least partially incompatible with terpene tackifying resins, said A-B-A block copolymer having a modulus at 300% extension of at least about 500 p.s.i. and an ultimate tensile strength in excess of about 2,000 p.s.i.; (b) from about 300 to about 400 parts by weight, per 100 parts by weight of said A-B-A block copolymer, of terpene tackifier resin; the amount of said terpene tackifier resin in said composition ranging from 40 to 60% by weight; (c) from about 150 to about 350 parts by weight of an essentially hydrocarbon oil selected from the group consisting of naphthenic oils, paraffinic oils, and mixtures thereof; the amount of said essentially hydrocarbon oil in said composition ranging from 15 to 40% by weight; said pressure-sensitive adhesive composition having a measurable 500% modulus at 23° C., being resistant to cohesive failure in P.S.T.C.-1 180° peel strength tests throughout the aforementioned range of essentially hydrocarbon oil content, and exhibiting P.S.T.C.-1 values in excess of about 4 pounds per inch width.

Claim 8

Dependent Claim 74 words

A pressure-sensitive adhesive composition according to claim 5, wherein: said pressure-sensitive adhesive is a 100% solids composition having a Brookfield viscosity of 500-10,000 centipoise at 300° F.; and said pressure-sensitive adhesive consists essentially of said A-B-A block copolymer, wherein said midblock is poly(ethylene-butylene); said terpene tackifier resin; said essentially hydrocarbon oil; and 0-100 parts by weight, per 100 parts by weight of said A-B-A block copolymer, of essentially inert extenders, fillers, pigments, or colorants.

Claim 9

Dependent Claim 79 words

In combination with a sanitary napkin comprising an elongated absorbent pad having essentially two major surfaces and an outer envelope means comprising a fluid-pervious nonwoven sheet-like wrapper encircling said absorbent pad having a seam therein running lengthwise along a said major surface, the improvement which comprises: a hot-melt pressure-sensitive adhesive layer impregnated into said seam and thereby adhered to the outwardly facing surface of said wrapper, said hot-melt pressure-sensitive adhesive being the hot-melt pressure-sensitive adhesive composition of claim 5.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1982-01-29	1982-07-31	1983-01-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1986-01-29	1986-07-31	1987-01-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1990-01-29	1990-07-31	1991-01-30	$7700.00	Window Closed / Lapsed

Absorbent article with adhesive strip

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