# US 11,028,207 B2 · Flame retardant polyolefin-type resin and preparation method as well as optic fiber cable using the same

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- Number: US 11,028,207 B2
- Document ID: US11028207B2
- Status: Granted
- Kind: B2
- Application number: 16/394,556
- Filed: 2019-04-25
- Published: 2019-08-15
- Granted: 2021-06-08
- Earliest claimed: 2016-10-26
- Assignees: Corning Incorporated
- Applicants: Corning Incorporated
- Inventors: Xiaole Cheng; Dayue Jiang
- Web page: https://patentgrep.com/patent/US11028207B2

## CPC

- C08F 8/32: by reaction with amines
- C03C 25/106: Single coatings
- C03C 25/18: Extrusion
- C03C 25/30: Polyolefins
- C08F 8/40: Introducing phosphorus atoms or phosphorus-containing groups
- C08F 210/02: Ethene
- C08F 222/06: Maleic anhydride
- C08F 255/026: {on to ethylene-vinylester copolymers}
- C08K 5/18: with aromatically bound amino groups
- C08K 5/524: Esters of phosphorous acids, e.g. of H3PO3
- C08L 51/06: grafted on to homopolymers or copolymers of aliphatic hydrocarbons containing only one carbon-to-carbon double bond
- H01B 7/00: Insulated conductors or cables characterised by their form
- H01B 7/295: using material resistant to flame
- C08F 220/1804: {C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate}
- C08L 2201/02: Flame or fire retardant/resistant
- C08L 2203/202: use in electrical wires or wirecoating
- C08L 2203/206: use in coating or encapsulating of electronic parts
- C08L 2205/16: Fibres; Fibrils
- G02B 6/4436: {Heat resistant}
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- H01B: CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES (selection for magnetic properties H01F1/00; waveguides H01P {; printed circuits H05K})
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A method of preparing a flame retardant grafted polyolefin resin is provided. The method includes a step of reacting in an extrusion barrel a reactive polyolefin and a monomeric flame retardant agent to form the flame retardant grafted polyolefin resin. The reactive polyolefin has a functional group including a moiety selected from the group consisting of anhydrides, epoxies, carboxylic acids, ketones, and isocyanates. The monomeric flame retardant agent has an amine functional group. The method also includes a step of extruding the flame retardant grafted polyolefin resin. Also provided is a flame retardant grafted polyolefin resin that can be made according to the method. Further provided is a flame retardant cable that incorporates can incorporate the flame retardant grafted polyolefin resin.

## Claims

### Claim 1

A method of preparing a flame retardant grafted polyolefin resin, the method comprising the steps of:
reacting in an extrusion barrel a reactive polyolefin and a monomeric flame retardant agent to form the flame retardant grafted polyolefin resin, wherein the reactive polyolefin has a functional group including a moiety selected from the group consisting of anhydrides, epoxies, carboxylic acids, ketones, and isocyanates and wherein the monomeric flame retardant agent has an amine functional group and contains at least one element selected from the group consisting of phosphorus, nitrogen, silicon, and sulfur, the at least one element comprising more than 10% by weight of the monomeric flame retardant agent; and
extruding the flame retardant grafted polyolefin resin.

### Claim 2 (depends on 1)

The method of claim 1, wherein the reactive polyolefin is a copolymer selected from the group consisting of olefin/glycidyl methacrylate, olefin/maleic anhydride, olefin/acrylate/glycidyl methacrylate, olefin/acrylate/maleic anhydride, and combinations thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the at least one element comprises more than 30% by weight of the monomeric flame retardant agent.

### Claim 4 (depends on 1)

The method of claim 1, wherein the amine functional group is a primary amine functional group.

### Claim 5 (depends on 1)

The method of claim 1, wherein the reactive polyolefin comprises from 51 wt % to 98 wt % of olefin repeating units.

### Claim 6 (depends on 1)

The method of claim 1, wherein the reactive polyolefin comprises from 2 wt % to 49 wt % of functional group repeating units.

### Claim 7 (depends on 6)

The method of claim 6, wherein the reactive polyolefin comprises from 2 wt % to 20 wt % of functional group repeating units.

### Claim 8 (depends on 1)

The method of claim 1, wherein the steps of reacting and extruding are performed in the extrusion barrel of a twin screw extruder.

### Claim 9 (depends on 8)

The method of claim 8, wherein, during the reacting step, the reactive polyolefin and the monomeric flame retardant agent resides in the extrusion barrel for a time of 30 minutes or less.

### Claim 10 (depends on 9)

The method of claim 9, wherein the reacting step is performed at a temperature of 140° C. or higher.

### Claim 11 (depends on 9)

The method of claim 9, wherein the reacting step achieves a conversion of at least 60%.

### Claim 12 (depends on 1)

The method of claim 1, wherein the functional group of the reactive olefin and the monomeric flame retardant agent are provided to the extrusion barrel in a molar ratio of between 1:2 and 2:1.

### Claim 13

A flame retardant grafted polyolefin resin, comprising:
a reactive polyolefin having a functional group including a moiety selected from the group consisting of anhydrides, epoxies, carboxylic acids, ketones, and isocyanates; and
a monomeric flame retardant agent including an amine group and containing at least one element selected from the group consisting of phosphorus, nitrogen, silicon, and sulfur, the at least one element comprising more than 10% by weight of the monomeric flame retardant agent;
wherein the monomeric flame retardant agent is grafted to the reactive polyolefin through a reaction between the amine group and the functional group of the reactive polyolefin.

### Claim 14 (depends on 13)

The flame retardant compound of claim 13, wherein the reactive polyolefin is a copolymer selected from the group consisting of olefin/glycidyl methacrylate, olefin/maleic anhydride, olefin/acrylate/glycidyl methacrylate, olefin/acrylate/maleic anhydride, and mixtures thereof.

### Claim 15 (depends on 13)

The flame retardant compound of claim 13, wherein amine functional group is a primary amine functional group.

### Claim 16 (depends on 13)

The flame retardant compound of claim 13, wherein the reactive polyolefin comprises from 2 wt % to 49 wt % of functional group repeating units.

### Claim 17

A flame retardant cable comprising:
at least one communication element;
a polymeric jacket that surrounds the at least one communication element;
wherein the polymeric jacket is formed at least in part from a flame retardant grafted polyolefin resin comprising:
a reactive polyolefin having a first functional group; and
a monomeric flame retardant agent have a second functional group;
wherein the monomeric flame retardant agent is grafted to the reactive polyolefin through a reaction between the first functional group and the second functional group.

### Claim 18 (depends on 17)

The flame retardant cable of claim 17, wherein the at least one communication element comprises an optical fiber.

### Claim 19 (depends on 17)

The flame retardant cable of claim 17, wherein the first functional group includes a moiety selected from the group consisting of anhydrides, epoxies, carboxylic acids, ketones, and isocyanates.

### Claim 20 (depends on 17)

The flame retardant cable of claim 17, wherein the monomeric flame retardant is comprised of at least 10% by weight of a at least one element selected from the group consisting of phosphorus, nitrogen, silicon, and sulfur.

### Claim 21 (depends on 17)

The flame retardant cable of claim 17, wherein the second functional group includes an amine.