DE2212998A1 - PROJECTION SCREEN - Google Patents

Description

Projection screen

The iiirfindung relates to a projection screen, esp. for ilellräuiiie.

Mr Hellzimmer, special picture walls have already been developed they consist of single aluminum foil, which is covered with a plastic film. It is still known that the Plastic film made transparent and with one embossing, consisting of parallel vertical grooves, to be provided. The IT parts of the well-known screens are hers. to low keflexion ability, 'their small angle of reflection, their low flexibility, as well as their non-true color reproduction of the image projected on them

The purpose of the invention is the production of a screen, especially * for bright rooms, which are not only simple and cheap is in the process of being manufactured, H. when rolling up and down, there is no hiae or deformation, which produces the picture true to color and in which the picture from all viewing angles with as possible high brightness is visible *

Accordingly, the task according to the invention is the adhesive required for the lamination aowie the plastic film for achieving the desired Reduce the demand

BATH ORIGINAL

209885/0780

The object is achieved in that the Adhesive consists of a combination of:

10 to 15 Ikaaeeteilsm ines butadiene-Acrylni briluischpolymerisates with 26 to 54 i> acrylonitrile, which at 20 ° G about 1ü tiin. be masticated,

Z bis / f *> parts of a butanol-etherified urine of f-IPormaldehyde urea,

2 to 5 feet of a ricine fatty acid modified Bpoxydharsester,

0.1 to 0.3 Tia3setteile of a chewing tachkatailizer,

1 to 2 parts of triphenylmethane-4,4 ·, 4 ^tr -triisoayanate

or

1 to 3 parts by mass of an Iaocyanate hardener of the formula ^C 33 ^H 3p ^ 6 ^ Q

dissolved in ethyl acetate to give a 35 # solution.

In particular, the solution according to the invention consists in that the adhesive consists of a foin powdered filler and that the plastic film is pyramidal Embossing "

The adhesive according to the invention has a high transparency, ao that an und ^ reduced reflection on the aluminum surface can take place Kr has a strong diffusion effect, which it is, according to the findings, increased by the mill powder mixture. This is the reason for the criticism Screen enlarged. Kinkel's purpose is to enlarge it

BATH ORIGINAL

209885/0780

-Jf-

furthermore the pyramid-like embossing of the plastic film Hiprzu is specifically mentioned that the pyramidal Pruning has the advantage over the ripple test, that the viewing angle increases in all directions The refractive index of the lamination adhesive fes hardly deviates from 1 »This results in optical inactivity and thus good color rendering of the reflected Image guaranteed »

In particular, the adhesive according to the invention has a high degree of flexibility and aging resistance are reached in the following yfeise j

The stabilized batadiene-acrylonitrile copolymer used is made pressure-sensitive adhesive by dismantling it for 20 minutes, dissolved in iithylacetet and gives a completely transparent one Solution that is increased significantly by the addition of urea resin, which is also completely transparent will continue to be effected by the addition of the oil modified Epoxy resin i # interaction with the urea hara a special hardening process, which is Proaeß of the Bpoxidhöraeater activated with the Luftsaueratoff is «through defined additions of isocyanate hardener there is a simultaneous, slight penetration of the KaUtschuks reached, which is only so far that the pressure-sensitive adhesive effect of the rubber is not completely lost goes and especially in combination with the other, described above Resin combinations result in a high, permanent bond between the aluminum foil and the soft PVO foil, which also as a diffusion barrier against one that reduces the adhesion Weichmaoherwanderung works and is permanently flexible " By adding a rubber stabilizer, the aging and light resistance of the adhesive can be further increased

BATH ORIGINAL ^ 4 "

209835/078 0

Example 1i

10 parts of a butadiene-acrylonitrile copolymer with 26 to 34 # acrylonitrile are masticated on a roller mill at 20 ° C for 10 minutes and then together with 2 parts of a butanol-etherified urine of f-Pormaldeiiydhara es, 2.5 ropes of a ricine fatty acid medicated Epoxydharsester, 0.1 part of a Kautachuk stabilizer and 1 part of triphenymethane-4,4 '» 41 »-triisocyanate in ethyl acetate to a 35 # length solution dissolved · The adhesive is applied to the carrier film applied, this is then applied after the solvent has evaporated combined with the aluminum foil under roller pressure at 20-30 °. The order is then placed on the aluminum surface and according to the same laminating method amination takes place with the PVG Vfeich film.

Example 2:

In the procedure described in Example 2, there are also Binsata:

10 parts by mass of a butadiene-acrylonitrile mixed polymer with 26 to 34 $ acrylonitrile are masticated on a roller mill at 20 ° for 10 minutes and then together with 2.5 parts of a butanol-etherified urea-maldehyde resin, 3.0 parts of a ricine fatty acid-modified epoxy resin ester, 0.1 Part of the rubber stabilizer and 1.5 ropes of isocyanate derivatives of the suramen formula ο ^, Η, ρ N 0 _Q · ν poor. eight.

209885/0780

Claims (1)

Projection screen, especially for bright rooms, consisting of an aluminum foil by means of an adhesive stolfea laminated with its transparent art «· fabric film, thereby gekennaei chnet that the adhesive consists of a combination of up to 15 hate parts of a butadiene-acrylonitrile copolymer with 26 to 34 f acrylonitrile, which are grounded at 20 ° for 10 minutes, up to 5 parts of a butanol ether Urinary Oxaldehyde HarifB, bia 5 Ma 3 aet ei learning a rioinenfettsäureaodifiaierten Üpoxydharaeatexai 0.1 to 0.3 parts by weight of a Käutschukatabiliaatox », bia 2 parts of Oiriphenylmethan -4,4 ', 4 * · · » iEriisooyanat or bia 3 Maos parts of an Iaocyanate hardener with the empirical formula 033H ₅₂ Ng Oq 2 »Screen according to claim 1, characterized by a finely powdered filler fzusat * aum adhesive / 3 · Screen according to claim 1, daduroh gekennaeioimet * that the plastic film has a pyramid-shaped embossing 209885/0780