Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
14 words
An improved process of claim 1 in which the precursor is a fibrous material.
Claim 2
Dependent Claim
13 words
An improved process of claim 1 in which the precursor is a film.
Claim 3
Dependent Claim
16 words
An improved process of claim 2 in which said acrylic fibrous material is an acrylonitrile homopolymer.
Claim 4
Dependent Claim
43 words
An improved process of claim 2 in which said acrylic fibrous material is an acrylonitrile copolymer containing at least about 95 mol per cent of acrylonitrile units and up to about 5 mol per cent of one or more monovinyl units copolymerized therewith.
Claim 5
Dependent Claim
30 words
An improved process of claim 1 in which said solution of said stannous chloride is provided at a temperature of about 10* to 40* C. during said impregnation step (a).
Claim 6
Dependent Claim
16 words
An improved process of claim 1 in which said solvent for said stannous chloride is water.
Claim 7
Dependent Claim
16 words
An improved process of claim 1 in which said solvent for said stannous chloride is methanol.
Claim 8
Dependent Claim
23 words
An improved process of claim 1 in which said drying step (b) is conducted at a temperature of about 10* to 40* C.
Claim 9
Dependent Claim
62 words
An improved process of claim 1 in which said resulting impregnated and dried fibrous material or film contains said stannous chloride in a concentration of about 1 to 5 per cent by weight based upon the weight of said acrylic fibrous material or film immediately prior to heating in said gaseous atmosphere containing 30 to 100 per cent molecular oxygen by weight.
Claim 10
Dependent Claim
22 words
An improved process of claim 1 in which said gaseous atmosphere contains about 35 to 100 per cent molecular oxygen by weight.
Claim 11
Dependent Claim
242 words
An improved process for the thermal stabilization of an acrylic fibrous material selected from the group consisting of an acrylonitrile homopolymer and acrylonitrile copolymers containing at least 85 mol per cent of acrylonitrile units and up to about 15 mol per cent of one or more monovinyl units copolymerized therewith to produce a thermally stabilized product exhibiting enhanced physical properties comprising: a. impregnating said fibrous material with about 1 to 5 per cent by weight of stannous chloride based upon the weight of said acrylic fibrous material by contact with a solution of said stannous chloride wherein the solvent is selected from the group consisting of water, methanol, and a mixture of methanol and water with the solution being provided at a temperature of about 10* to 40* C., b. drying said fibrous material to substantially remove the solvent therefrom, and c. heating said resulting impregnated and dried fibrous material in a gaseous atmosphere containing 35 to 100 per cent by weight molecular oxygen provided at a temperature of about 290* to 310* C. while maintaining a substantially constant length until a thermally stabilized fibrous material is formed which is black in appearance, retains its original confIguration substantially intact, contains a bound oxygen content of at least 7 per cent by weight, and which is non-burning when subjected to an ordinary match flame, with any portion of said gaseous atmosphere other than molecular oxygen being substantially unreactive with the material undergoing stabilization.
Claim 12
Dependent Claim
16 words
An improved process of claim 12 in which said acrylic fibrous material is an acrylonitrile homopolymer.
Claim 13
Dependent Claim
43 words
An improved process of claim 12 in which said acrylic fibrous material is an acrylonitrile copolymer containing at least about 95 mol per cent of acrylonitrile units and up to about 5 mol per cent of one or more monovinyl units copolymerized therewith.
Claim 14
Dependent Claim
23 words
An improved process of claim 12 in which said drying step (b) is conducted at a temperature of about 10* to 40* C.
Claim 15
Dependent Claim
22 words
An improved process of claim 12 in which said gaseous atmosphere contains about 40 to 60 per cent molecular oxygen by weight.