Flexible polypropylene resin compositions, films or sheets made

Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...

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Details

526 72, 526351, 428343, C08L 2310, C08K 517, C08J 518, C09J 702

Patent

active

060968141

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to flexible polypropylene resin compositions with good weather resistance for use in surface protection, and to films or sheets made from them.
2. Description of the Background
Heretofore, vinyl chloride-based resins have been used for surface-protective films for construction materials, furniture, etc. However, because of the problems with the resins in that the plasticizer in them is toxic and that they generate toxic gas when their wastes are incinerated, the resins are being substituted with polyolefin resins.
Surface-protective films or sheets of polyolefin resins are known, for example, in Japanese Patent Application Laid-Open (JP-A) Hei-5-92514 in which is disclosed a technique of adding a hindered amine light stabilizer (hereinafter referred to as HALS) singly or as combined with an ultraviolet absorbent (hereinafter referred to as UVA) to surface-protective films comprising a polyolefin/adhesive layer for vehicles, steel pipes and others, for the purpose of improving the weather resistance of the films.
In JP-A Hei-6-212033, disclosed are polyolefin resin compositions comprising a high-molecular weight HALS (molecular weight: not smaller than 2000) and UVA. They say that the coatability of the compositions in high-solid-type coating is good and the weather resistance of the films of the compositions is good.
However, surface-protective films or sheets of conventional polyolefin resins for construction materials, furniture and others are not always satisfactory with respect to their surface-protective effect, apparent quality, etc. Surface-protective films or sheets of flexible polypropylene resins having an adhesive layer or an ink layer formed thereon are problematic in that the discoloration resistance, the weather resistance and the adhesion retentiveness of the ink layer and the adhesive layer are not always satisfactory even though the additives noted above are added thereto. The present invention is to provide flexible polypropylene resin compositions of which the moldings such as films or sheets have good weather resistance, and to provide films or sheets of the compositions. The invention is also to provide flexible polypropylene resin compositions capable of being formed into surface-protective films or sheets as combined with an ink layer and/or an adhesive layer formed on their inner surface, in which the ink layer has good discoloration resistance and weather resistance and the adhesive layer has good adhesion retentiveness and weather resistance, and to provide surface-protective films or sheets of the compositions of which the inner surface is optionally supported by a substrate film or sheet.


SUMMARY OF THE INVENTION

In order to attain the objects noted above, we, the present inventors have assiduously studied and, as a result, have found that the flexible polypropylene resin compositions mentioned below and also their moldings especially films or sheets satisfy the requirements for the objects. On the basis of these findings, we have completed the invention.


DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Specifically, the invention provides the following:
(1) A flexible polypropylene resin composition comprising 100 parts by weight of a flexible polypropylene resin having (a) a peak melting temperature (Tm) of 150.degree. C. or above as measured through differential scanning calorimetry (DSC) and (b) a tensile modulus of elasticity of from 200 to 700 MPa, and from 0.05 to 5 parts by weight of a hindered amine light stabilizer.
(2) The flexible polypropylene resin composition of (1), wherein the flexible polypropylene resin comprises (A) from 20 to 100% by weight of a propylene homopolymer having (c) a pentad fraction, rrrr/(1-mmmm).times.100, as measured through isotopic carbon nuclear magnetic resonance spectrometry (.sup.13 C-NMR) of from 20 to 60%, and (d) a melting enthalpy (.DELTA.H) as measured through differential scanning calorimetry (DSC) of from 10 to 100 J/g, and/or a propylene

REFERENCES:
patent: 5216056 (1993-06-01), Suhoza
patent: 5955524 (1999-09-01), Azuma et al.
06263934 A JP Abstract, Sep. 1994.
3-168224 A J.P. Abstract, Jul. 1991.
0721631 A J.P. Abstract, Aug. 1995.

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