Laminate having anti-bacterial and mildewproofing actions

Details Laminate having anti-bacterial and mildewproofing actions Laminate having anti-bacterial and mildewproofing actions

1998-06-29

2001-03-13

Zirker, Daniel (Department: 1771)

Drug, bio-affecting and body treating compositions

Preparations characterized by special physical form

Wearing apparel, fabric, or cloth

C424S402000, C514S365000, C442S123000, C442S124000

Reexamination Certificate

active

06200582

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a laminate having anti-bacterial and mildewproofing actions, and more particularly to a laminate having anti-bacterial and mildewproofing actions such as a laminated film and a laminated sheet having anti-bacterial and mildewproofing actions, and a bag made of the same.
2. Description of the Related Arts
Recently, greater importance of an anti-bacterial and mildewproofing properties of various articles is emphasized not only in facilities wherein hygienic control is required, such as hospitals, but also in homes in general, and along therewith, impartment of anti-bacterial and mildewproofing actions to films, sheets, bags, and the like for packaging is demanded.
Conventionally, as films having an anti-bacterial effect, films are known that are made by mixing an inorganic type anti-bacterial agent containing a metal or metal ions in a synthetic resin. However, although the anti-bacterial effect of this type of films lasts long, this type of films has the defect that the effect is exhibited only on the surfaces brought into contact with the film.
On the other hand, a bag is suggested that contains an anti-bacterial agent of an organic substance (natural substance) type that exhibits an anti-bacterial effect also on surfaces not in contact therewith, but generally the effect of the anti-bacterial is poor in durability, and to make it durable, a special treatment such as microcapsulization is needed, leading to the defect that the cost is increased remarkably.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a laminate that overcomes the above problems of the prior art, exhibits durable anti-bacterial and mildewproofing actions without any special processing, is inexpensive, and exhibits anti-bacterial and mildewproofing actions even on surfaces not in contact therewith.
The inventors of the present invention have intensively investigated with a view to aiming at the above object and have found that a laminate made by cladding films or sheets together using an adhesive or an adhesive resin containing parachlorometaxylenol (PCMX) out of various anti-bacterial and mildewproofing substances meets the above object. The present invention has been completed on the basis of that finding.
Namely, the present invention provides a laminate having anti-bacterial and mildewproofing actions, comprising at least two films or sheets each having organic substance permeability different from one another; and at least one adhesive layer which comprises an anti-bacterial mildewproofing agent containing parachlorometaxylenol as an active ingredient, and which intervenes between the adjacent films or sheets so that they are clad to one another.
DETAILED DESCRIPTION OF THE INVENTION
The films or sheets used in the present invention are not particularly restricted but may be selected from combinations of various films or sheets different from one another in organic substance permeability, such as synthetic resin films or sheets, paper molded items, fabrics, and metal films or sheets. Examples of the usable synthetic resin film or sheet include a film or sheet of a polyolefin such as a polyethylene and a polypropylene, a polyvinyl chloride, a polyvinylidene chloride, a polyamide such as nylon, a cellulose such as cellophane, a polyester such as a polyethylene terephthalate, or an ethylene/vinyl alcohol copolymer resin (EVOH). The pulp molded item includes, for example, an item of paper or a synthetic paper. Examples of the metal for the film or sheet include aluminum, copper, iron, and a stainless steel, which are used, for example, in the form of aluminum foil.
The combination includes a combination of synthetic resins and a combination of a synthetic resin with paper, a pulp molded item, a fabric, or a metal. The greater the difference in organic substance permeability in the films or sheets of the combination is, the more the anti-bacterial and mildewproofing actions on one of the films or sheets is expected, which is effective.
By way of parenthesis, herein, the term “organic substance permeability” means permeability of a gas composed of an organic substance, such as PCMX gas.
Parachlorometaxylenol used as an anti-bacterial mildewproofing agent is low in vapor pressure (the vapor pressure: 0.0033 mmHg at 20° C.) and less sublimable at normal temperatures and keeps its anti-bacterial and mildewproofing effect for a long period of time. Accordingly, the intended object can be satisfactorily attained only by lamination without requiring any special processing such as microcapsulization. Thus, an inexpensive laminate can be provided.
The laminate of the present invention is one obtained by incorporating parachlorometaxylenol in an intervening adhesive layer that clads at least two films or sheets different from one another in organic substance permeability.
As the lamination method, a variety of lamination methods can be employed, which can be suitably selected in accordance with the combination of the films or sheets that are clad to one another, and examples are a dry lamination method, a wet lamination method, an extrusion sandwich lamination method, a wax coater lamination method, and a hot-melt lamination method.
Since parachlorometaxylenol dissolves quickly in ethyl acetate that is a solvent for dry lamination (87 g/100 ml at 25° C.), it is dispersed uniformly in the dry lamination process and the effect can be expected throughout the laminate surfaces.
Further, since, in the wet lamination method, a solution type or emulsion type adhesive wherein parachlorometaxylenol is dispersed uniformly can be prepared, a uniform anti-bacterial and mildewproofing effect can be obtained.
Furthermore, the sandwich lamination method can be applied and, in this case, an anti-bacterial mildewproofing agent containing parachlorometaxylenol as an active ingredient is mixed in an adhesive agent and the mixture can be used by heating-melting.
The adhesive and the adhesive resin are not particularly restricted but can be suitably selected in accordance with the films or sheets that will be clad to one another.
The laminate of the present invention contains, in an adhesive layer, an anti-bacterial mildewproofing agent whose active ingredient is parachlorometaxylenol, and preferably the content of parachlorometaxylenol in the adhesive layer is 0.1 to 60% by weight (the content of parachlorometaxylenol in the laminate is 0.002 to 1.35 g/m
2
). If the content of parachlorometaxylenol is less than 0.1% by weight, a satisfactory anti-bacterial and mildewproofing effect cannot be secured, whereas if the content is more than 60% by weight, there arises the problem that the adhesion strength between the films is lowered.
Further, the anti-bacterial mildewproofing agent can contain, in addition to the above active ingredient, a variety of additive components if desired.
Since the laminate of the present invention contains an anti-bacterial mildewproofing agent in an adhesive layer, if one comes in direct contact with the laminate, there is no fear that one comes in direct contact with a large amount of the anti-bacterial mildewproofing agent and therefore the laminate is high in safety. Furthermore, parachlorometaxylenol is an anti-bacterial mildewproofing agent high in safety since its acute toxicity is 3,450 mg/kg or more (orally, rats).
Since the laminate of the present invention contains an anti-bacterial mildewproofing agent in an adhesive layer, the gaseous sublimate of the anti-bacterial mildewproofing agent sublimed from the adhesive layer exhibits the anti-bacterial and mildewproofing effect and therefore the anti-bacterial and mildewproofing effect can be expected at parts not in contact with the laminate.
In the case where the laminate is made into a bag, the anti-bacterial and mildewproofing effect can be expected throughout the inside of the bag. Further, by using a film good in permeability on the inside of a bag, a bag can be obtained wherein the anti-bacterial and mildewproofing effect is exhibited pre

Affiliated with

Also associated with

Rating

Laminate having anti-bacterial and mildewproofing actions does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Laminate having anti-bacterial and mildewproofing actions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Laminate having anti-bacterial and mildewproofing actions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2523112