COMPOSITE FILM Russian patent published in 2022 - IPC B32B27/12 B32B27/18 B32B27/40 B32B5/18 B32B7/12 B32B5/02 

FIELD: composite materials.

SUBSTANCE: invention relates to a composite film, preferably intended for use in construction and/or for use as a construction film. The film contains at least one functional layer, at least one outer protective layer and at least one inner protective layer, with the functional layer located between the outer protective layer and the inner protective layer. According to the invention, it is provided that the functional layer is made in the form of at least a single-layer membrane layer, the outer protective layer and the inner protective layer are made in the form of a polyolefin-containing layer of non-woven material and the outer protective layer and/or inner protective layer contains at least one bicomponent fiber with the first component and the second component, and as a component the first component contains the first polymer, and the second component contains the second polymer, and the composite film is made to allow diffusion, and moreover, the functional layer as a material contains thermoplastic polyurethane (TPU) or consists of it.

EFFECT: invention provides a composite film that has good resistance to atmospheric influences, high resistance to UV radiation and, thus, can be used for a longer period of time and provide the required characteristics of resistance to weather conditions, as well as through the use of bicomponent fiber in at least one protective layer can significantly increase its mechanical strength.

29 cl, 14 dwg