High strength polyamide fibers and films

Claim 2

FIBER OR FILM OF POLYAMIDE HAVING AN INHERENT VISCOSITY OF AT LEAST 2.5 AS MEASURED AT A CONCENTRATION OF 0.5 GRAM OF POLYMER IN 100 ML. OF CONCENTRATED SULFURIC ACID (95-98% H2SO4) AT 30*C. AND CONSISTING ESSENTIALLY OF RECURRING UNITS SELECTED FROM THE GROUP CONSISTING OF:

Claim 3

Fiber or film of homopolyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 4

Fiber or film of homopolyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 5

Fiber or film of claim 1 wherein n is the integer one and R and R'' are selected from the consisting of 1,4-phenylene, 4,4''-biphenylene 2,6-naphthylene, 1,5-naphthylene and trans-1,4-cyclohexylene; R may also be selected from the group consisting of 2,5-pyridylene and trans-vinylene; and R'''' is 1,4-phenylene.

Claim 6

A fiber of poly(p-phenylene terephthalamide) having a filament tenacity of at least 18 grams per denier, a filament elongation of at least 3.5 percent, an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and crystalline regions with a primary apparent crystallite size (PACS) of less than 52A as determined from an X-ray diffractogram scan along a line perpendicular to the fiber axis using the equation: PACS lambda / Beta cos theta where lambda represents the wavelength in A of the X-rays used; theta is the Bragg angle and Beta is the line breadth in radians, corrected for instrumental broadening, at half intensity of the major reflection located at the smallest value of 2 theta .

Claim 7

A fiber of poly(p-phenylene terephthalamide) having a filament tenacity of at least 18 grams per denier, a filament elongation of at least 3.5 percent, an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and crystalline regions with a primary apparent crystallite size (PACS) of less than 52A as determined from an X-ray diffractogram scan along a line perpendicular to the fiber axis using the equation: PACS lambda / Beta cos theta where lambda represents the wavelength in A of the X-rays used; theta is the Bragg angle and Beta is the line breadth in radians, corrected for instrumental broadening, at half intensity of the major reflection located at the smallest value of 2 theta .

Claim 8

The fiber of claim 4 further characterized by a structure that exhibits radial orientation having a lateral crystallite order value of at least 10 as determined from selected peak heights of densitometer traces of electron diffraction patterns of regions on the short and long axes of a 0.1 to 0.2 micron thick oblique section of the fiber.

Claim 9

The fiber of claim 5 having a filament elongation of at least 4.5 percent and an inherent viscosity of at least 3.0.

Claim 10

A fiber of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 11

A fiber of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 12

The fiber of claim 7 wherein n is the integer one and R and R'' are selected from the group consisting of 1,4-phenylene, 4,4''-biphenylene 2,6-naphthylene, 1,5-naphthylene and trans-1,4-cyclohexylene; R may also be selected from the group consisting of 2,5-pyridylene and trans-vinylene; and R'''' is 1,4-phenylene.

Claim 13

A film of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 14

A film of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 15

The film of claim 9 having a tenacity of at least about 18 grams per denier.

Claim 16

Fiber or film of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 17

Fiber or film of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5 gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 18

Fiber of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5. gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of:

Claim 19

Fiber of polyamide having an inherent viscosity of at least 2.5 as measured at a concentration of 0.5. gram of polymer in 100 ml. of concentrated sulfuric acid (95-98% H2SO4) at 30*C. and consisting essentially of recurring units selected from the group consisting of: