# US 11,111,323 B2 · Homopolypropylene resin for non-woven fabric and method for preparing the same

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- Number: US 11,111,323 B2
- Document ID: US11111323B2
- Status: Granted
- Kind: B2
- Application number: 16/636,719
- Filed: 2018-11-08
- Published: 2020-07-30
- Granted: 2021-09-07
- Earliest claimed: 2017-11-08
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Hee Kwang Park; Byung Seok Kim; Kyung Seop Noh; Sang Jin Jeon; Seong Min Chae
- Web page: https://patentgrep.com/patent/US11111323B2

## CPC

- C08F 110/06: Propene
- D04H 3/007: Addition polymers
- D04H 1/4291: Olefin series
- C08F 2/02: Polymerisation in bulk
- C08F 4/65912: {in combination with an organoaluminium compound}
- C08F 4/65916: {supported on a carrier, e.g. silica, MgCl2, polymer}
- C08F 4/65927: {two cyclopentadienyl rings being mutually bridged}
- C08F 2420/01: Cp or analog bridged to a non-Cp X neutral donor
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- D04H: MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL (weaving D03; knitting D04B; braiding D04C; net-making D04G; sewing D05B; tufting D05C; finishing non-woven fabrics D06); FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING {; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION}(non-woven fabrics having an intermediate or external layer of a different kind, e.g. of woven fabric, B32B)

## Abstract

The present invention relates to homopolypropylene resin for non-woven fabric, and according to the present invention, by optimizing tacticity to 80% to 90%, having narrow molecular weight distribution of 2.4 or less, and fulfilling melt index of 20 g/10 min to 30 g/10 min, melting point of 145° C. or less, and residual stress rate of 0.05% or less, thereby optimizing modulus, high strength non-woven fabric that is softer than the existing products, and is not easily torn due to high tenacity, can be prepared.

## Claims

### Claim 1

A homopolypropylene resin for non-woven fabric, wherein the homopolypropylene resin has tacticity of 80% to 90%, molecular weight distribution of 2.4 or less, melt index of 20 g/10 min to 30 g/10 min, melting point of 145° C. or less, and residual stress rate of 0.05% or less.

### Claim 2 (depends on 1)

The homopolypropylene resin according to claim 1, wherein the homopolypropylene resin has molecular weight distribution of 2.1 to 2.4.

### Claim 3 (depends on 1)

The homopolypropylene resin according to claim 1, wherein the homopolypropylene resin has melting point of 133° C. to 143° C.

### Claim 4 (depends on 1)

The homopolypropylene resin according to claim 1, wherein the homopolypropylene resin has tacticity of 82% to 87%.

### Claim 5 (depends on 1)

The homopolypropylene resin according to claim 1, wherein the homopolypropylene resin has melt index of 23 g/10 min to 26 g/10 min.

### Claim 6 (depends on 1)

The homopolypropylene resin according to claim 1, wherein the homopolypropylene resin has residual stress rate of 0.006% to 0.03%.

### Claim 7 (depends on 1)

A method for preparing the homopolypropylene resin according to claim 1, comprising a step of polymerizing propylene in the presence of a single catalyst comprising only a transition metal compound represented by the following Chemical Formula 1 as a catalytically active component:
in the Chemical Formula 1,
A is carbon, silicon or germanium,
M is Group 4 transition metal;
X1 and X2 are identical to or different from each other, and are each independently, halogen, substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C2-20 alkenyl, substituted or unsubstituted C6-20 aryl, nitro, amido, substituted or unsubstituted C1-20 alkylamino, substituted or unsubstituted C6-20 arylamino, substituted or unsubstituted C1-20 alkylsilyl, substituted or unsubstituted C1-20 alkoxy, or substituted or unsubstituted C1-20 sulfonate;
R1 and R6 are identical to or different from each other, and are each independently, hydrogen, or substituted or unsubstituted C1-20 alkyl;
R2 and R3, and R7 and R8 are respectively connected with each other to form a substituted or unsubstituted C6-20 aliphatic or aromatic ring;
R4, R5, R9, and R10 are identical to or different from each other, and are each independently, hydrogen, halogen, substituted or unsubstituted C1-20 alkyl, substituted or unsubstituted C2-20 alkenyl, substituted or unsubstituted C1-20 alkylsilyl, substituted or unsubstituted C1-20 silylalkyl, substituted or unsubstituted C1-20 alkoxysilyl, substituted or unsubstituted C1-20 ether, substituted or unsubstituted C1-20 silylether, substituted or unsubstituted C1-20 alkoxy, substituted or unsubstituted C6-20 aryl, substituted or unsubstituted C7-20 alkylaryl, or substituted or unsubstituted C7-20 arylalkyl; and
R11 and R12 are identical to each other, and are C2-20 alkyl.

### Claim 8 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein R2 and R3, and R7 and R8 are respectively connected with each other to form C6-20 aryl.

### Claim 9 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein the transition metal compound is represented by the following Chemical Formula 1-17:
in the Chemical Formula 1-1,
A, M, X1, X2, R1, R4, R5, R6, R9, R10, R11, and R12 are the same as defined above.

### Claim 10 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein A is silicon, and M is zirconium or hafnium.

### Claim 11 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein X1 and X2 are each independently, halogen.

### Claim 12 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein R1 and R6 are each independently, hydrogen, or C1-5 linear alkyl.

### Claim 13 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein R4, R5, R9, and R10 are hydrogen.

### Claim 14 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein R11 and R12 are identical to each other, and are C2-4 linear alkyl.

### Claim 15 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein the transition metal compound is represented by one of the following Structural Formulas:

### Claim 16 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein the polymerization step is conducted by continuous bulk-slurry polymerization process.

### Claim 17 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein A is silicon; M is Zr or Hf; each of X1 and X2 is halogen; each of R1 and R6 is hydrogen or methyl; R2 and R3, and R7 and R8 are respectively connected with each other to form C6-20 aryl; R4, R5, R9, and R10 are hydrogen; R11 and R12 are identical to each other, and C2-4 linear alkyl group.

### Claim 18 (depends on 7)

The method for preparing homopolypropylene resin for non-woven fabric according to claim 7, wherein the step of polymerizing propylene is conducted under hydrogen gas.