A multi-layer film structure suitable as a sealable sheet used for closing foodstuff containers with a peelable seal. This multi-layer film comprises a polyester substrate layer and a heat-sealable layer. The heat-sealable layer is applied by coextrusion and contains an epoxy-containing thermoplastic polymer composition comprising residues of epoxy-containing monomers selected from glycidyl methacrylate, glycidyl acrylate, allyl glycidyl ether, 3,4-epoxy-1-butene, and a mixture of any two or more of such monomers.

Disclosed is a laminated floor using a poly lactic acid (PLA) resin, of which a surface layer is formed of the PLA resin, thereby being environment-friendly and providing soft feeling and excellent workability. The laminated floor using a PLA resin, which is constructed on floor, includes a bottom layer formed of a HDF or MDF; and a surface layer comprising a reinforcement layer, a printed layer, a transparent layer and a surface treatment layer which are stacked on the bottom layer, wherein one or more of the reinforcement layer, the printed layer, the transparent layer and the surface treatment layer are formed of the PLA resin.

A fabric containing carbon fibers impregnated with a silicone, polyurethane or acrylic emulsion which is then dried together with the fabric is disclosed. A protective layer containing a film, a woven or non-woven fabric is applied onto one side of the fabric.

A dental appliance for positioning a patient's teeth includes a removable orthodontic tooth positioning appliance having teeth receiving cavities shaped to directly receive at least some of the patient's teeth and apply a resilient positioning force to the patient's teeth. The appliance includes a hard polymer layer having a hard polymer layer elastic modulus disposed between a first soft polymer layer having a first soft polymer layer elastic modulus and a second soft polymer layer having a second soft polymer layer elastic modulus. The hard polymer layer elastic modulus is greater than each of the first soft polymer layer elastic modulus and the second soft polymer layer elastic modulus. At least one of the first soft polymer layer and the second soft polymer layer has a flexural modulus of greater than about 35,000 psi.

A dental appliance for positioning a patient's teeth includes a removable orthodontic tooth positioning appliance having teeth receiving cavities shaped to directly receive at least some of the patient's teeth and apply a resilient positioning force to the patient's teeth. The appliance includes a hard polymer layer having a hard polymer layer elastic modulus disposed between a first soft polymer layer having a first soft polymer layer elastic modulus and a second soft polymer layer having a second soft polymer layer elastic modulus. The hard polymer layer elastic modulus is greater than each of the first soft polymer layer elastic modulus and the second soft polymer layer elastic modulus. At least one of the first soft polymer layer and the second soft polymer layer has a flexural modulus of greater than about 35,000 psi.

A superstrate can include a body, a first layer, and a second layer, wherein the first layer is disposed between the body and the second layer. Each of the first and second layers has a proximal surface and a distal surface opposite the proximal surface, wherein the body is closer to the proximal surface than to the distal surface. An Ra of the distal surface of the second layer is less than an Ra of the distal surface of the first layer. In a method of making the superstrate, the relatively high Ra of the distal surface of the first layer may be related to the process or equipment used in forming the first layer. The second layer can be formed using another superstrate, where the Ra of the distal surface of the second layer is substantially the same as the contact surface of the other superstrate.

A dental appliance for positioning a patient's teeth includes a removable orthodontic tooth positioning appliance having teeth receiving cavities shaped to directly receive at least some of the patient's teeth and apply a resilient positioning force to the patient's teeth. The appliance includes a hard polymer layer having a hard polymer layer elastic modulus disposed between a first soft polymer layer having a first soft polymer layer elastic modulus and a second soft polymer layer having a second soft polymer layer elastic modulus. The hard polymer layer elastic modulus is greater than each of the first soft polymer layer elastic modulus and the second soft polymer layer elastic modulus. At least one of the first soft polymer layer and the second soft polymer layer has a flexural modulus of greater than about 35,000 psi.

Provided are hydrophilic substrates provided with a hydrophilic polymer layer having controlled surface uniformity and irregularities, and methods for preparing the hydrophilic substrates. Included are hydrophilic substrates including a substrate having a surface containing at least one group represented by N(R.sup.1).sub.2 or N(R.sup.2).sub.3.sup.+ wherein each R.sup.1 or R.sup.2 is the same or different and represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group optionally containing a hetero atom; and a hydrophilic polymer layer provided on the surface of the substrate.