Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Reexamination Certificate
2000-06-01
2001-12-25
Short, Patricia A. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
C525S089000, C525S932000
Reexamination Certificate
active
06333383
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a non-crystalline polyester resin composition. More particularly, the present invention relates to a non-crystalline polyester resin composition which comprises a non-crystalline polyester resin component and an epoxy-modified block copolymer component obtained by epoxidation of unsaturated bonds in a block copolymer comprising a block polymer of a vinyl aromatic compound and a block polymer of a conjugated diene compound, the resin composition being in a specified range with respect to an epoxy-equivalent, an absolute difference value between the refractive index of each component and a mixed ratio of each component, being excellent in moldability and secondary processing properties, being improved in transparency and impact-resistance of a molding thereof and being given a balanced mechanical strength.
2. Description of the Related Arts
A non-crystalline polyester resin is excellent in processing properties of its molding, mechanical properties and chemical properties, in addition to its moldability, and is used in a variety of fields.
In more detail, the non-crystalline polyester resin is excellent in such moldability as extrusion-, injection-, hollow-, rotational-, compression-, pressure-, vacuum- and free blow-molding, and besides excellent in such mechanical processing as cutting, grinding and bending processing of a film, sheet, plate, container or the like obtained by its molding, in such adhesive processing properties as ultrasonic adhesion, heat adhesion and solvent adhesion, and in such secondary processing properties as silk printing, gravure printing and pad printing. Moreover, the above-mentioned polyester resin and the moldings thereof are excellent in a solvent resistance and an oil resistance, and accordingly are widely used for automobile parts, electronic machinery and tools, office-work appliances, or packages of medical appliance parts, various protective covers, display sheets, indoor partitions, floor materials such as a flooring, refrigerators, containers for frozen food, containers for miscellaneous goods, or the like.
Although the non-crystalline polyester resin has a weak point in transparency and impact strength of a molding thereof, recently, the non-crystalline polyester resin or its molding having an appropriate softness as well as an excellent transparency and a high impact resistance, specifically in the fields of the display sheets, indoor partitions, package films, containers, or protective covers, among the above-mentioned various fields for use, has been sought up to the present.
In general, an elastomer having a rubber-elasticity or a compatibility-enhancing agent is added, as means to solve the impact resistance and also the softness-improvement of a synthesized resin, its resin composition or a molding thereof. In almost cases as such, the molding decreases visual transparency thereof and it is impossible to satisfy impact resistance or softness with transparency at the same time. Accordingly, the above-elastomer or the compatibility-enhancing agent has not been utilized appreciably for the objects which require transparency.
In order to improve the visual transparency, it is well known that the compatibility-improvement of the resin component to be mixed with the elastomer or the like and moreover allowing each refractive index of the components to come as near as possible are effective. However, it has been, heretofore, considered impossible to find out a resin composition which has a high visual transparency in a solid phase and gives impact resistance and softness effectively.
SUMMARY OF THE INVENTION
It is, therefore, an object of the present invention to provide a non-crystalline polyester resin composition which provides a high transparency and impact resistance to the moldings, obtained by the use of a non-crystalline polyester resin used in various fields.
As the result of intensive studies to solve the above-object, the present inventor has found out that the object of the present invention can be achieved by mixing, in a specified range, a non-crystalline polyester resin component with an epoxy-modified block copolymer component having a specified range of an epoxy equivalent, obtained by epoxidation of a block copolymer comprising a block polymer of a vinyl aromatic compound and a block polymer of a conjugated diene compound, and further by limiting difference between the refractive-indexes of both components to a specified range. The present invention is based on these findings. The gist of the present invention will be described below.
The first aspect of the present invention relates to a non-crystalline polyester resin composition which comprises 50 to 99% by weight of a non-crystalline polyester resin (component A) and 1 to 50% by weight of an epoxy-modified block copolymer (component B) (total of both components being 100% by weight), obtained by epoxidation of a block copolymer (B3) comprising a block polymer (B1) containing mainly a unit based on a vinyl aromatic compound and a block polymer (B2) containing mainly a unit based on a conjugated diene compound, an epoxy equivalent of component B being in the range of 400 to 7,500 and an absolute value of refractive-index difference between both components A and B being 0.008 or less.
The second aspect of the present invention relates to a non-crystalline polyester resin composition according to the above-stated first aspect of the present invention, wherein the component B is an epoxy-modification of a hydrogenated block copolymer obtained by epoxidation of the hydrogenated block copolymer, the hydrogenated block copolymer being a partially hydrogenated block copolymer (B3).
The third aspect of the present invention relates to a non-crystalline polyester resin composition according to the above-stated first aspect of the present invention, wherein component B is a mixture of an epoxy-modification of a non-hydrogenated block copolymer obtained by epoxidation of the non-hydrogenated block copolymer (B3) and the epoxy-modification of a hydrogenated block copolymer.
The fourth aspect of the present invention relates to a non-crystalline polyester resin composition according to any one of the above-stated first to third aspects of the present invention, wherein at least one part of the vinyl aromatic compounds contained in the component B is a styrene, and a styrene amount contained in the component B being 60 to 90% by weight.
DESCRIPTION OF THE PREFERRED EMBODIMENT
In the following, the present invention will be explained in detail.
The non-crystalline polyester resin, one of the constitutional components of the non-crystalline polyester resin composition according to the present invention, in a chemical meaning, is a resin obtained by esterification of a dicarboxylic acid component with a diol component. The non-crystalline polyester resin may be exemplified by any one of (1) a copolyester resin wherein two or more kinds of compounds are used in at least one component of the dicarboxylic acid component and the diol component, (2) a mixed polyester resin wherein one kind of a homopolyester resin and the above-mentioned copolyester resin (1) are used, and (3) a mixed polyester resin wherein two or more kinds of the above-mentioned homopolyester resin are used. Namely, these are meant by the polyester resins which can produce a substantially non-crystalline molding under an ordinary molding condition. Herein, “non-crystalline” is meant by that a definite peak of melting point will not be recognized by Differential Scanning Calorimetry (DSC) measurement on the basis of JIS K7121 (a method for measuring a transition-temperature of plastics).
As the dicarboxylic acid, constituting the non-crystalline polyester resin according to the present invention, a terephthalic acid is most preferably used. Examples of the other dicarboxylic acids to be used together with the terephthalic acid include an aromatic, a chain aliphatic, or an alicyclic dicarboxylic acid such as an isophthalic acid, a naphtha
Daicel Chemical Industries Ltd.
Nixon & Vanderhye P.C.
Short Patricia A.
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