§
Luxuse
Patent Intelligence
Sign In
← Back to Patent Explorer
US4176148A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of manufacturing microporous paper-like butene-1 polymer sheets

Assignee: Princeton Chemical Research Inc
•
Filing: 1974-07-12
•
Granted: 1979-11-27
•
Expires: 1994-07-12
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A paper like butene-1 polymer sheet material is made by extruding a composition comprising (a) about 20 to 97% by weight of a butene-1 polymer having a molecular weight in excess of about 20,000, an isotacticity of at least about 25% and a butene-1 content of at least about 50% by weight, and (b) about 3 to 80% by weight of at least one normally solid filler insoluble in said polymer, to form a sheet, and stretching said sheet at least about 5% beyond its yield strain. The filler may be organic or inorganic and the sheet is preferably stretched at least about 20% beyond its yield point. The sheet is characterized by a novel surface appearance when scanned in an electron microscope, by dimensional stability and by approximately equal strengths in all directions as evidenced by a maximum tensile strength ratio of about 13:1 in mutually perpendicular directions.

Inventors

  • 👤 Jules Magder
  • 👤 Murray H. Reich

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 15:59
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/18; C08L23/20; C08K; C08K3/00; C08K3/01; C08K3/013

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 117 words
The process for making paper-like sheet material which comprises extruding a composition comprising (a) about 20 to 97% by weight of a butene-1 film-forming polymer having a molecular weight in excess of about 20,000, an isotacticity of at least about 25% and a butene-1 content of at least about 50% by weight, and (b) about 3 to 80% by weight of at least one normally solid filler insoluble in said polymer, to form a sheet, and stretching said sheet below about 60° C. at least about 5% beyond its yield strain substantially over its entire surface, whereby the surface of said sheet is rendered discontinuous due to formation of micropores, said sheet is opacified and rendered paper-like.
Claim 2
Dependent Claim 117 words
The process for making paper-like sheet material which comprises extruding a composition comprising (a) about 20 to 97% by weight of a butene-1 film-forming polymer having a molecular weight in excess of about 20,000, an isotacticity of at least about 25% and a butene-1 content of at least about 50% by weight, and (b) about 3 to 80% by weight of at least one normally solid filler insoluble in said polymer, to form a sheet, and stretching said sheet below about 60° C. at least about 5% beyond its yield strain substantially over its entire surface, whereby the surface of said sheet is rendered discontinuous due to formation of micropores, said sheet is opacified and rendered paper-like.
Claim 3
Dependent Claim 36 words
The process according to claim 1, wherein said filler in the resulting sheet has a particle size of less than about 10 microns and is present in about 5 to 80% by weight of the composition.
Claim 4
Dependent Claim 13 words
The process according to claim 2, wherein said filler comprises an organic solid.
Claim 5
Dependent Claim 29 words
The process according to claim 3, wherein said filler comprises an organic polymer and is present to the extent of at least about 10% by weight of the composition.
Claim 6
Dependent Claim 13 words
The process according to claim 2, wherein said filler comprises an inorganic solid.
Claim 7
Dependent Claim 23 words
The process according to claim 1, wherein said sheet is stretched in two transverse directions at least about 20% beyond its yield strain.
Claim 8
Dependent Claim 14 words
The process according to claim 1, including the further step of applying ink thereto.

References Cited (Backward Citations)

US3154461A Cited
US3551194A Cited
US3544489A Cited
US3796778A Cited
US3840625A Cited
US3839240A Cited
US3903234A Cited
US3843761A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1982-11-26 1983-05-28 1983-11-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1986-11-26 1987-05-28 1987-11-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1990-11-26 1991-05-28 1991-11-27 $7700.00 Window Closed / Lapsed

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag