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US RE35,621 EGranted
Cardable hydrophobic polypropylene fiber, material and method for preparation thereof
AssigneeHercules Incorporated
InventorA. Chandler Schmalz
Life of this patent
Estimating the term…
Abstract
A method for placing hydrophobic polyolefin fiber in condition for cutting, carding and production of nonwoven material without substantial sacrifice in desired hydrophobic properties in the corresponding nonwoven, by utilization of a sequential treatment of the fiber with a neutralized phosphoric acid ester and a polysiloxane of defined classes.
Claims42
A method for preparing essentially hydrophobic polyolefin-containing spun fiber or filament for cutting and carding steps in the production of hydrophobic nonwoven material, comprising
- A. initially treating corresponding continuous spun fiber or filament with an effective amount for fiber or filament processing to avoid difficulties generated by friction and accumulated static charge of a first modifier composition comprising
- (a) about 70%-100% by weight of modifier composition of at least one neutralized phosphoric acid ester represented by the formula ##STR3## wherein Alk is individually defined as a lower alkyl group,
- R is defined as an amino group or an alkali metal,
- n and m are individually defined as positive numbers of not less than ..about.!. 1, the sum of which is about 3;
- and
- (b) up to about 30% by weight of modifier composition of at least one polysiloxane represented by the formula ##STR4## wherein X and Y are defined as hydrophobic chemical end groups,
- R' is individually defined as a lower alkyl group, and
- o is defined as a positive number ..within the range.!. of at least about 10 ..-50 or higher.!.;
- B. crimping the resulting continuous fiber or filament in a crimper;
- C. applying to said fiber or filament an effective amount for fiber or filament processing to avoid difficulties generated by friction and accumulated static charge of a second modifier composition comprising
- (a) about 70%-100%, by weight of second modifier composition, of at least one polysiloxane represented by formula (2) and
- (b) up to about 30%, by weight of second modifier composition, of at least one neutralized phosphoric acid ester represented by formula (1);
- D. processing the resulting modifier-treated fiber or filament to obtain one or more webs for bonding;
- and
- E. bonding the resulting web to obtain a desired hydrophobic nonwoven material.
12 more elements
A ..Crimped.!. crimped essentially hydrophobic polyolefin-containing fiber obtained by
- A. initially treating corresponding continuous spun fiber or filament with an effective amount for fiber or filament processing to avoid difficulties generated by friction and accumulated static charge of a first modifier composition comprising
- (a) about 70%-100% by weight of modifier composition of at least one neutralized phosphoric acid ester represented by the formula ##STR5## wherein Alk is individually defined as a lower alkyl group,
- R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than ..about.!. 1, the sum of which is about 3;
- and
- (b) up to about 30% by weight of modifier composition of at least one polysiloxane represented by the formula ##STR6## wherein X and Y are defined as hydrophobic chemical end groups,
- R' is individually defined as a lower alkyl group, and
- o is defined as a positive number ..within the range.!. of at least about 10 ..-50 or higher.!.;
- B. crimping and applying to said fiber or filament an effective amount for fiber or filament processing to avoid difficulties generated by friction and accumulated static charge of a second modifier composition comprising
- (a) about 70%-100%, by weight of second modifier composition, of at least one polysiloxane represented by formula (2), and
- (b) up to about 30%, by weight of second modifier composition, of at least one neutralized phosphoric acid ester represented by formula ..(I).!. (1) .
7 more elements
The method for preparing essentially hydrophobic polyolefin-containing fiber or filament, comprising:
- treating continuous polyolefin-containing fiber or filament with a first composition comprising at least one neutralized phosphoric acid ester represented by the formula ##STR7## wherein Alk is individually defined as a lower alkyl group, R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than 1, the sum of which is about 3;
- crimping the polyolefin-containing fiber or filament subsequent to treatment with the first composition;
- and
- treating the crimped polyolefin-containing fiber or filament with a second composition comprising at least one neutralized phosphoric acid ester represented by the formula ##STR8## wherein Alk is individually defined as a lower alkyl group, R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than 1, the sum of which is about 3.
1 more element
An essentially hydrophobic polyolefin-containing fiber or filament, comprising:
- polyolefin-containing fiber or filament including a coating comprising at least one neutralized phosphoric acid ester represented by the formula ##STR11## wherein Alk is individually defined as a lower alkyl group, R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than 1, the sum of which is about 3.
The fiber or filament according to claim 34, wherein said coating further comprises at least one polysiloxane. . The fiber or filament according to claim 35, wherein said at least one polysiloxane comprises at least one polysiloxane represented by the formula ##STR12## wherein X and Y are defined as hydrophobic chemical end groups,
- R' is individually defined as a lower alkyl group, and
- o is defined as a positive number of at least about 10.
The fiber or filament according to claim 36, wherein o is defined as a positive number of about 10 to 50.
A method for preparing essentially hydrophobic polyolefin-containing spun fiber or filament for cutting and carding steps in the production of hydrophobic nonwoven material, comprising
- A. initially treating corresponding continuous spun fiber or filament with from about 0.09% to 0.5% based on the weight of the fiber or filament of a first modifier composition comprising
- (a) about 70%-100% by weight of modifier composition of at least one neutralized phosphoric acid ester represented by the formula ##STR13## wherein Alk is individually defined as a lower alkyl group, R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than 1, the sum of which is about 3;
- and
- (b) up to about 30% by weight of modifier composition of at least one polysiloxane represented by the formula ##STR14## wherein X and Y are defined as hydrophobic chemical end groups,
- R' is individually defined as a lower alkyl group, and
- o is defined as a positive number of at least about 10;
- B. crimping the resulting continuous fiber or filament in a crimper;
- C. applying to said fiber or filament from about 0.05% to 0.20% based on the weight of the fiber or filament of a second modifier composition comprising
- (a) about 70%-100%, by weight of second modifier composition, of at least one polysiloxane represented by formula (2), and
- (b) up to about 30%, by weight of second modifier composition, of at least one neutralized phosphoric acid ester represented by formula (1);
- D. processing the resulting modifier-treated fiber or filament to obtain one or more webs for bonding;
- and
- E. bonding the resulting web to obtain a desired hydrophobic nonwoven
- material.
11 more elements
A crimped essentially hydrophobic polyolefin-containing fiber obtained by
- A. initially treating corresponding continuous spun fiber or filament with from about 0.09% to 0.5% based on the weight of the fiber or filament of a first modifier composition comprising
- (a) about 70%-100% by weight of modifier composition of at least one neutralized phosphoric acid ester represented by the formula ##STR15## wherein Alk is individually defined as a lower alkyl group, R is defined as an amino group or an alkali metal, n and m are individually defined as positive numbers of not less than 1, the sum of which is about 3;
- and
- (b) up to about 30% by weight of modifier composition of at least one polysiloxane represented by the formula ##STR16## wherein X and Y are defined as hydrophobic chemical end groups,
- R' is individually defined as a lower alkyl group, and
- o is defined as a positive number of at least about 10;
- B. crimping and applying to said fiber or filament from about 0.05% to 0.20% based on the weight of the fiber or filament of a second modifier composition comprising
- (a) about 70%-100%, by weight of second modifier composition, of at least one polysiloxane represented by formula (2), and
- (b) up to about 30%, by weight of second modifier composition, of at least one neutralized phosphoric acid ester represented by formula (1). .Iaddend .
6 more elements
Dependencies are inferred from the claim text.