US4255164A — Fining sheet and method of making and using the s…

Claim 1

Independent Claim 175 words

A fining sheet being capable of generating a fining slurry when subjected to an aqueous flow, pressure, and movement against vitreous stock being fined, comprising a flexible, conformable backing sheet covered on one side thereof with a microcellular layer having a weight of at least 450 g. per m 2 and a thickness of at least 10 mils said layer being comprised of (a) a cured modified resinous binder material having a Knoop hardness value in the range of 15 to 50 and being selected from a group consisting of urea formaldehyde and phenol formaldehyde modified with about 1% to about 40% by weight of a thermoplastic polymeric modifier selected from the group consisting of polyamide, polyacrylate, polyacrylonitrile, polyvinyl ester, polyvinyl alcohol, and copolymers comprising said thermoplastic polymeric modifiers and combinations thereof; and (b) abrasive fining granules having a Knoop hardness of at least about 1000 and an average particle size of about 15 to 60 microns to provide a volume ratio of abrasive granules to binder in the range of about 0.75:1 to 1.75:1.

Claim 2

Dependent Claim 175 words

A fining sheet being capable of generating a fining slurry when subjected to an aqueous flow, pressure, and movement against vitreous stock being fined, comprising a flexible, conformable backing sheet covered on one side thereof with a microcellular layer having a weight of at least 450 g. per m 2 and a thickness of at least 10 mils said layer being comprised of (a) a cured modified resinous binder material having a Knoop hardness value in the range of 15 to 50 and being selected from a group consisting of urea formaldehyde and phenol formaldehyde modified with about 1% to about 40% by weight of a thermoplastic polymeric modifier selected from the group consisting of polyamide, polyacrylate, polyacrylonitrile, polyvinyl ester, polyvinyl alcohol, and copolymers comprising said thermoplastic polymeric modifiers and combinations thereof; and (b) abrasive fining granules having a Knoop hardness of at least about 1000 and an average particle size of about 15 to 60 microns to provide a volume ratio of abrasive granules to binder in the range of about 0.75:1 to 1.75:1.

Claim 3

Dependent Claim 34 words

The fining sheet in accordance with claim 1 in the form of a circular disc having radially aligned slots commencing at its edge and extending toward but not reaching the center of said disc.

Claim 4

Dependent Claim 15 words

The fining sheet in accordance with claim 1 in the form of an endless belt.

Claim 5

Dependent Claim 24 words

The fining sheet in accordance with claim 1 including a pressure-sensitive adhesive on the surface opposite the abrasive surface of said flexible backing sheet.

Claim 6

Independent Claim 133 words

A method of making a fining sheet comprising: (1) mixing a curable resin composition containing from about 99% to about 60% by weight of a thermosetting material selected from urea-formaldehyde and phenol-formaldehyde with from about 1% to about 40% thermoplastic polymeric modifier in a suitable liquid vehicle, with abrasive fining abrasive granules having an average particle size of 15 to 60 microns to provide a volume ratio of abrasive granules to resin on the order of 0.75:1 to 1.75:1 and to form a cellular viscous mass; (2) coating the viscous mass on a conformable, flexible sheet to provide a substantially uniform coating thickness of at least 10 mils when dried; (3) drying and curing the coating at a temperature of less than about 140° C., to form a rigid microcellular abrasive granule-resin matrix.

Claim 7

Independent Claim 133 words

A method of making a fining sheet comprising: (1) mixing a curable resin composition containing from about 99% to about 60% by weight of a thermosetting material selected from urea-formaldehyde and phenol-formaldehyde with from about 1% to about 40% thermoplastic polymeric modifier in a suitable liquid vehicle, with abrasive fining abrasive granules having an average particle size of 15 to 60 microns to provide a volume ratio of abrasive granules to resin on the order of 0.75:1 to 1.75:1 and to form a cellular viscous mass; (2) coating the viscous mass on a conformable, flexible sheet to provide a substantially uniform coating thickness of at least 10 mils when dried; (3) drying and curing the coating at a temperature of less than about 140° C., to form a rigid microcellular abrasive granule-resin matrix.

Claim 8

Dependent Claim 89 words

A method of fining vitreous surfaces comprising: (1) applying a fining sheet according to claim 1 to a vitreous surface to be fined; and (2) moving said fining sheet with respect to said vitreous surface in forced contact with rotational and/or oscillatory movement while maintaining said abrasive fining sheet in an aqueous environment which is continuously being replenished for a time sufficient to separate abrasive particles from said sheet at a rate and concentration to produce and maintain a slurry of abrasive particles capable of fining said vitreous surface.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1984-03-09	1984-09-08	1985-03-10	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1988-03-09	1988-09-08	1989-03-10	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1992-03-09	1992-09-08	1993-03-10	$7700.00	Window Closed / Lapsed

Fining sheet and method of making and using the same

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