# US 2020/0399447 A1 · Resin composition and molded resin object

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- Number: US 2020/0399447 A1
- Document ID: US20200399447A1
- Status: Published application
- Kind: A1
- Application number: 16/977,647
- Filed: 2018-07-17
- Published: 2020-12-24
- Earliest claimed: 2018-03-06
- Assignees: Eastman Chemical Company
- Applicants: Eastman Chemical Company
- Inventors: Kenjie Yao; Ryo Tanaka; Kana Miyazaki; Masahiro Moriyama
- Web page: https://patentgrep.com/patent/US20200399447A1

## CPC

- C08L 1/14: Mixed esters, e.g. cellulose acetate-butyrate
- C08K 5/10: Esters; Ether-esters
- C08L 33/10: Homopolymers or copolymers of methacrylic acid esters
- C08L 67/04: Polyesters derived from hydroxycarboxylic acids, e.g. lactones (C08L67/06 takes precedence)
- C08L 67/08: Polyesters modified with higher fatty oils or their acids, or with resins or resin acids
- C08L 51/04: grafted on to rubbers
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2207/53: Core-shell polymer
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)

## Abstract

A resin composition, including a cellulose acylate including at least one type selected from cellulose acetate propionate and cellulose acetate butyrate, a polylactic acid, an ester compound having a molecular weight of 250 or more and 2,000 or less, and a polymer with a core-shell structure having a core layer and a shell layer including a (meth)acrylic polymer on the surface of the core layer, wherein the ratio of the mass of the polylactic acid to the mass of the cellulose acylate is 0.03 or more and 0.5 or less, the ratio of the mass of the ester compound to the mass of the cellulose acylate is 0.03 or more and 0.15 or less, and the ratio of the mass of the polymer with a core-shell structure to the mass of the cellulose acylate is 0.01 or more and 0.1 or less.

## Claims

### Claim 1

A resin composition, comprising:
a cellulose acylate (A) including at least one type selected from cellulose acetate propionate and cellulose acetate butyrate,
a polylactic acid (B),
an ester compound (C) having a molecular weight of 250 or more and 2,000 or less, and
a polymer with a core-shell structure (D) having a core layer and a shell layer including a (meth)acrylic polymer on the surface of the core layer, wherein:
the ratio ((B)/(A)) of the mass of the polylactic acid (B) to the mass of the cellulose acylate (A) is 0.03 or more and 0.5 or less,
the ratio ((C)/(A)) of the mass of the ester compound (C) to the mass of the cellulose acylate (A) is 0.03 or more and 0.15 or less, and
the ratio ((D)/(A)) of the mass of the polymer with a core-shell structure (D) to the mass of the cellulose acylate (A) is 0.01 or more and 0.1 or less.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein the resin composition has a weld line impact strength of 10 kJ/m2 or more, and a value obtained by dividing the weld line impact strength by Charpy impact strength is 0.5 or more.

### Claim 3

(canceled)

### Claim 4 (depends on 1)

The resin composition according to claim 1, wherein the ester compound is a fatty acid ester compound.

### Claim 5 (depends on 4)

The resin composition according to claim 4, wherein the fatty acid ester compound is a compound containing an adipate.

### Claim 6 (depends on 1)

The resin composition according to claim 1, further comprising a (meth)acrylic polymer not contained in the shell layer (E).

### Claim 7 (depends on 6)

The resin composition according to claim 6, wherein the (meth)acrylic polymer not contained in the shell layer (E) is a polymer having a structural unit derived from an alkyl (meth)acrylate, and the ratio ((E)/(A)) of the (meth)acrylate polymer not contained in the shell layer (E) to the mass of the cellulose acylate (A) is 0.01 or more and 0.1 or less.

### Claim 8 (depends on 6)

The resin composition according to claim 6, wherein the average molecular weight of the (meth)acrylic polymer not contained in the shell layer (E) is 30,000 or less.

### Claim 9 (depends on 1)

The resin composition according to claim 1, wherein the (meth)acrylic polymer contained in the shell layer of the polymer with a core-shell structure includes an alkyl (meth)acrylate wherein the number of carbon atoms in the alkyl chain is 1 or more and 8 or less.

### Claim 10 (depends on 1)

The resin composition according to claim 1, wherein the (meth)acrylic polymer contained in the shell layer of the polymer with a core-shell structure includes a copolymer of two or more types of an alkyl (meth)acrylate wherein the number of carbon atoms in the alkyl chains is different.

### Claim 11 (depends on 1)

A resin-molded body, comprising the resin composition according to claim 1.

### Claim 12 (depends on 11)

The resin-molded body according to claim 11, wherein the resin-molded body is an injection-molded body.