US4898924A — Process for the production of biaxially oriented …

Claim 1

Independent Claim 73 words

A process for preparing a biaxially oriented film of a rigid rod heterocyclic liquid crystalline polymer comprising, (i) providing a dope from a polymerization mixture of a rigid rod heterocyclic liquid crystalline polymer and a solvent; (ii) extruding the dope to form a film; (iii) imparting biaxial orientation to the film to increase the transverse strength thereof; (iv) solidifying the biaxially oriented film; and (v) washing the solidified film to remove the solvent.

Claim 2

Dependent Claim 73 words

A process for preparing a biaxially oriented film of a rigid rod heterocyclic liquid crystalline polymer comprising, (i) providing a dope from a polymerization mixture of a rigid rod heterocyclic liquid crystalline polymer and a solvent; (ii) extruding the dope to form a film; (iii) imparting biaxial orientation to the film to increase the transverse strength thereof; (iv) solidifying the biaxially oriented film; and (v) washing the solidified film to remove the solvent.

Claim 3

Dependent Claim 31 words

A process according to claim 1 wherein the rigid rod heterocyclic liquid crystalline polymer comprises a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d')bisthiazole2,6-diyl) 1,4-phenylene}, its cis isomer and mixtures thereof.

Claim 4

Dependent Claim 31 words

A process according to claim 1 wherein the rigid rod heterocyclic liquid crystalline polymer comprises a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d')bisoxazole-2,6-diyl) 1,4-phenylene}, its cis isomer and mixtures thereof.

Claim 5

Dependent Claim 31 words

A process according to claim 1 wherein the rigid rod heterocyclic liquid crystalline polymer comprises a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d')bisthiazole2,6-diyl) 1,4-phenylene}, its cis isomer and mixtures thereof.

Claim 6

Dependent Claim 12 words

A process according to claim 4 wherein the dope is vertically extruded.

Claim 7

Dependent Claim 27 words

A process according to claim 5 wherein the dope is extruded downwardly through a tubular die, expanded by blowing, and solidified in a coagulant bath including water.

Claim 8

Dependent Claim 12 words

A process according to claim 4 wherein the dope is horizontally extruded.

Claim 9

Dependent Claim 33 words

A process according to claim 7 wherein the dope is extruded horizontally through a die to form a tube of the film, said film is expanded by blowing and solidified by water spraying.

Claim 10

Dependent Claim 31 words

A process according to claim 4 wherein the extruded dope is coated on an internal support to form a film and said internal support is rotated to biaxially orient the film.

Claim 11

Dependent Claim 14 words

A process according to claim 9 wherein the internal support is a deformable support.

Claim 12

Dependent Claim 17 words

A process according to claim 9 further comprising, (vi) separating the internal support from the solidified film.

Claim 13

Dependent Claim 29 words

A process according to claim 1 further comprising, (vi) drying the washed film; and (vii) heat treating the dried film to further enhance the overall strength of the film.

Claim 14

Dependent Claim 29 words

A process according to claim 4 further comprising, (vi) drying the washed film; and (vii) heat treating the dried film to further enhance the overall strength of the film.

Claim 15

Dependent Claim 23 words

A process according to claim 13 wherein the heat treatment is carried out at a temperature of about 375° to about 650° C.

Claim 16

Dependent Claim 23 words

A process according to claim 14 wherein the heat treatment is carried out at a temperature of about 500° to about 650° C.

Claim 17

Dependent Claim 14 words

A process according to claim 13 wherein the film is heat treated under tension.

Claim 18

Dependent Claim 11 words

A polymer film layer produced by the process of claim 1.

Claim 19

Dependent Claim 91 words

A process for preparing a biaxially oriented liquid crystal polymer film or poly{(benzo(1,2-d:4,5-d')bisthiazole2,6-diyl) 1,4-phenylene}, its cis isomer or mixtures thereof comprising, (i) providing a dope from a polymerization mixture of a solution comprising a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d') bisthiazole-2,6-diyl) 1,4-phenylene}, its cis isomer and mixtures thereof, and polyphosphoric acid; (ii) extruding the dope through a tubular die to form a film; (iii) expanding the film by blowing to impart transverse strength thereto; (iv) solidifying the expanded film; and (v) washing the solidified film to remove the solvent.

Claim 20

Dependent Claim 91 words

A process for preparing a biaxially oriented liquid crystal polymer film or poly{(benzo(1,2-d:4,5-d')bisthiazole2,6-diyl) 1,4-phenylene}, its cis isomer or mixtures thereof comprising, (i) providing a dope from a polymerization mixture of a solution comprising a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d') bisthiazole-2,6-diyl) 1,4-phenylene}, its cis isomer and mixtures thereof, and polyphosphoric acid; (ii) extruding the dope through a tubular die to form a film; (iii) expanding the film by blowing to impart transverse strength thereto; (iv) solidifying the expanded film; and (v) washing the solidified film to remove the solvent.

Claim 21

Dependent Claim 29 words

A process according to claim 18 further comprising, (vi) drying the washed film; and (vii) heat treating the dried film to further enhance the overall strength of the film.

Claim 22

Dependent Claim 11 words

A polymer film layer produced by the process of claim 18.

Claim 23

Dependent Claim 10 words

A polymer film produced by the process of claim 19.

Claim 24

Dependent Claim 91 words

A process for preparing a biaxially oriented liquid crystal polymer film of poly{(benzo(1,2-d:4,5-d')bisoxazole-2,6-diyl) 1,4-phenylene}, its cis isomer or mixtures thereof comprising, (i) providing a dope from a polymerization mixture of a solution comprising a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d') bisoxazole-2,6-diyl) 1,4-phenylene}), its cis isomer and mixtures thereof, and a solvent; (ii) extruding the dope through a tubular die to form a film. (iii) expanding the film by blowing to impart transverse strength thereto; (iv) solidifying the expanded film; and (v) washing the solidified film to remove the solvent.

Claim 25

Dependent Claim 91 words

A process for preparing a biaxially oriented liquid crystal polymer film of poly{(benzo(1,2-d:4,5-d')bisoxazole-2,6-diyl) 1,4-phenylene}, its cis isomer or mixtures thereof comprising, (i) providing a dope from a polymerization mixture of a solution comprising a member selected from the group consisting of poly{(benzo(1,2-d:4,5-d') bisoxazole-2,6-diyl) 1,4-phenylene}), its cis isomer and mixtures thereof, and a solvent; (ii) extruding the dope through a tubular die to form a film. (iii) expanding the film by blowing to impart transverse strength thereto; (iv) solidifying the expanded film; and (v) washing the solidified film to remove the solvent.

Claim 26

Dependent Claim 29 words

A process according to claim 22 further comprising, (vi) drying out washed film; and (vii) heat treating the dried film to further enhance the overall strength of the film.

Claim 27

Dependent Claim 11 words

A polymer film layer produced by the process of claim 22.

Claim 28

Dependent Claim 11 words

A polymer film layer produced by the process of claim 23.

Claim 29

Dependent Claim 15 words

A process according to claim 9 wherein the internal support is a rigid rod support.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1993-02-05	1993-08-07	1994-02-06	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1997-02-05	1997-08-07	1998-02-06	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2001-02-05	2001-08-07	2002-02-06	$7700.00	Window Closed / Lapsed

Process for the production of biaxially oriented rigid rod heterocyclic liquid crystalline polymer films

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